{"topic":"cuprate-mechanism","sort":"top","limit":25,"offset":0,"count":25,"papers":[{"id":"arxiv:1803.02342","kind":"article","title":"Unconventional superconductivity in magic-angle graphene superlattices","authors":["Yuan Cao","Valla Fatemi","Shiang Fang","Kenji Watanabe","Takashi Taniguchi","Efthimios Kaxiras","Pablo Jarillo‐Herrero"],"author_count":7,"year":2018,"published":"2018-03-05","venue":"Nature","cited_by":8329,"doi":"10.1038/nature26160","arxiv_id":"1803.02342","nct_id":null,"source_url":"https://doi.org/10.1038/nature26160","archive_url":"https://space-kitty.com/papers/arxiv:1803.02342","updated":"2018-05-20","pmid":"29512651","pmcid":null,"openalex_id":"W2793369479","pdf_url":"https://www.nature.com/articles/nature26160.pdf","abstract":"The understanding of strongly-correlated materials, and in particular unconventional superconductors, has puzzled physicists for decades. Such difficulties have stimulated new research paradigms, such as ultra-cold atom lattices for simulating quantum materials. Here we report on the realization of intrinsic unconventional superconductivity in a 2D superlattice created by stacking two graphene sheets with a small twist angle. For angles near $1.1^\\circ$, the first `magic' angle, twisted bilayer graphene (TBG) exhibits ultra-flat bands near charge neutrality, which lead to correlated insulating states at half-filling. Upon electrostatic doping away from these correlated insulating states, we observe tunable zero-resistance states with a critical temperature $T_c$ up to 1.7 K. The temperature-density phase diagram shows similarities with that of the cuprates, including superconducting domes. Moreover, quantum oscillations indicate small Fermi surfaces near the correlated insulating phase, in analogy with under-doped cuprates. The relative high $T_c$, given such small Fermi surface (corresponding to a record-low 2D carrier density of $10^{11} \\textrm{cm}^{-2}$ , renders TBG among the strongest coupling superconductors, in a regime close to the BCS-BEC crossover. These novel results establish TBG as the first purely carbon-based 2D superconductor and as a highly tunable platform to investigate strongly-correlated phenomena, which could lead to insights into the physics of high-$T_c$ superconductors and quantum spin liquids.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:2305.09586","kind":"article","title":"Signatures of superconductivity near 80 K in a nickelate under high pressure","authors":["Hualei Sun","Mengwu Huo","Xunwu Hu","Jingyuan Li","Zengjia Liu","Yifeng Han","Lingyun Tang","Zhongquan Mao","Pengtao Yang","Bosen Wang","Jinguang Cheng","Dao‐Xin Yao","Guang-Ming Zhang","Meng Wang"],"author_count":14,"year":2023,"published":"2023-07-12","venue":"Nature","cited_by":748,"doi":"10.1038/s41586-023-06408-7","arxiv_id":"2305.09586","nct_id":null,"source_url":"https://doi.org/10.1038/s41586-023-06408-7","archive_url":"https://space-kitty.com/papers/arxiv:2305.09586","updated":"2023-05-16","pmid":"37437603","pmcid":null,"openalex_id":"W4384028978","pdf_url":"https://arxiv.org/pdf/2305.09586","abstract":"High-transition-temperature (high-T_c) superconductivity in cuprates has been discovered for more than three decades, but the underlying mechanism remains a mystery. Cuprates are the only unconventional superconducting family that host bulk superconductivity with T_cs above the liquid nitrogen boiling temperature at 77 Kelvin. Here we report an observation of superconductivity in single crystals of La3Ni2O7 with a maximum T_c of 80 Kelvin at pressures between 14.0-43.5 gigapascals using high-pressure resistance and mutual inductive magnetic susceptibility measurements. The superconducting phase under high pressure exhibits an orthorhombic structure of Fmmm space group with the 3d_(x^2-y^2 ) and 3d_(z^2 ) orbitals of Ni cations strongly interacting with oxygen 2p orbitals. Our density functional theory calculations suggest the superconductivity emerges coincidently with the metallization of the σ-bonding bands under the Fermi level, consisting of the 3d_(z^2 ) orbitals with the apical oxygens connecting Ni-O bilayers. Thus, our discoveries not only reveal important clues for the high-T_c superconductivity in this Ruddlesden-Popper double-layered perovskite nickelates but also provide a new family of compounds to investigate the high-T_c superconductivity mechanism.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"doi:10.1126/science.1197294","kind":"article","title":"Light-Induced Superconductivity in a Stripe-Ordered Cuprate","authors":["Daniele Fausti","Ra'anan I. Tobey","Nicky Dean","Stefan Kaiser","A. Dienst","Matthias C. Hoffmann","Sunseng Pyon","T. Takayama","H. Takagi","A. Cavalleri"],"author_count":10,"year":2011,"published":"2011-01-13","venue":"Science","cited_by":1204,"doi":"10.1126/science.1197294","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1126/science.1197294","archive_url":"https://space-kitty.com/papers/doi:10.1126/science.1197294","updated":null,"pmid":"21233381","pmcid":null,"openalex_id":"W2049545343","pdf_url":null,"abstract":null,"abstract_license":null,"license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex","attribution":"Metadata and citation counts: OpenAlex (CC0)."},{"id":"arxiv:1206.4333","kind":"article","title":"Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67","authors":["J. Chang","E. Blackburn","A. T. Holmes","Niels Bech Christensen","Jacob Larsen","J. Mesot","Ruixing Liang","D. A. Bonn","W. N. Hardy","A. Watenphul","Martin v. Zimmermann","Edward M. Forgan","S. M. Hayden"],"author_count":13,"year":2012,"published":"2012-10-12","venue":"Nature Physics","cited_by":1091,"doi":"10.1038/nphys2456","arxiv_id":"1206.4333","nct_id":null,"source_url":"https://doi.org/10.1038/nphys2456","archive_url":"https://space-kitty.com/papers/arxiv:1206.4333","updated":"2012-07-03","pmid":null,"pmcid":null,"openalex_id":"W2096343998","pdf_url":"https://www.nature.com/articles/nphys2456.pdf","abstract":"Superconductivity often emerges in the proximity of, or in competition with, symmetry breaking ground states such as antiferromagnetism or charge density waves (CDW)1-5. A number of materials in the cuprate family, which includes the high-transition-temperature (high-Tc) superconductors, show spin and charge density wave order5-7. Thus a fundamental question is to what extent these ordered states exist for compositions close to optimal for superconductivity. Here we use high-energy x-ray diffraction to show that a CDW develops at zero field in the normal state of superconducting YBa2Cu3O6.67 (Tc = 67 K). Below Tc, the application of a magnetic field suppresses superconductivity and enhances the CDW. Hence, the CDW and superconductivity are competing orders in this typical high-Tc superconductor, and high-Tc superconductivity can form from a pre-existing CDW state. Our results explain observations of small Fermi surface pockets8, negative Hall and Seebeck effect9,10 and the \"Tc plateau\"11 in this material when underdoped.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:2012.15709","kind":"article","title":"Unconventional chiral charge order in kagome superconductor KV3Sb5","authors":["Yu-Xiao Jiang","Jia-Xin Yin","M. Michael Denner","Nana Shumiya","Brenden R. Ortiz","Gang Xu","Zurab Guguchia","Junyi He","Md Shafayat Hossain","Xiaoxiong Liu","Jacob P. C. Ruff","Linus Kautzsch","Songtian S. Zhang","Guoqing Chang","Ilya Belopolski","Qi Zhang","Tyler A. Cochran","Daniel Multer","Maksim Litskevich","Zi-Jia Cheng","Xian P. Yang","Ziqiang Wang","Ronny Thomale","Titus Neupert","Stephen D. Wilson"],"author_count":26,"year":2021,"published":"2021-06-10","venue":"Nature Materials","cited_by":746,"doi":"10.1038/s41563-021-01034-y","arxiv_id":"2012.15709","nct_id":null,"source_url":"https://doi.org/10.1038/s41563-021-01034-y","archive_url":"https://space-kitty.com/papers/arxiv:2012.15709","updated":"2021-05-05","pmid":"34112979","pmcid":null,"openalex_id":"W3152768594","pdf_url":"https://arxiv.org/pdf/2012.15709","abstract":"Intertwining quantum order and nontrivial topology is at the frontier of condensed matter physics. A charge density wave (CDW) like order with orbital currents has been proposed as a powerful resource for achieving the quantum anomalous Hall effect in topological materials and for the hidden phase in cuprate high-temperature superconductors. However, the experimental realization of such an order is challenging. Here we use high-resolution scanning tunnelling microscopy (STM) to discover an unconventional charge order in a kagome material KV3Sb5, with both a topological band structure and a superconducting ground state. Through both topography and spectroscopic imaging, we observe a robust 2x2 superlattice. Spectroscopically, an energy gap opens at the Fermi level, across which the 2x2 charge modulation exhibits an intensity reversal in real-space, signaling charge ordering. At impurity-pinning free region, the strength of intrinsic charge modulations further exhibits chiral anisotropy with unusual magnetic field response. Theoretical analysis of our experiments suggests a tantalizing unconventional chiral CDW in the frustrated kagome lattice, which can not only lead to large anomalous Hall effect with orbital magnetism, but also be a precursor of unconventional superconductivity.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Advanced Condensed Matter Physics"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1109.2011","kind":"article","title":"Magnetic-field-induced charge-stripe order in the high-temperature superconductor YBa2Cu3Oy","authors":["Tao Wu","H. Mayaffre","S. Krämer","M. Horvatić","C. Berthier","W. N. Hardy","Ruixing Liang","D. A. Bonn","M.-H. Julien"],"author_count":9,"year":2011,"published":"2011-09-01","venue":"Nature","cited_by":755,"doi":"10.1038/nature10345","arxiv_id":"1109.2011","nct_id":null,"source_url":"https://doi.org/10.1038/nature10345","archive_url":"https://space-kitty.com/papers/arxiv:1109.2011","updated":"2011-09-09","pmid":"21901009","pmcid":null,"openalex_id":"W2047287764","pdf_url":"https://arxiv.org/pdf/1109.2011","abstract":"Electronic charges introduced in copper-oxide planes generate high-transition temperature superconductivity but, under special circumstances, they can also order into filaments called stripes. Whether an underlying tendency of charges to order is present in all cuprates and whether this has any relationship with superconductivity are, however, two highly controversial issues. In order to uncover underlying electronic orders, magnetic fields strong enough to destabilise superconductivity can be used. Such experiments, including quantum oscillations in YBa2Cu3Oy (a notoriously clean cuprate where charge order is not observed) have suggested that superconductivity competes with spin, rather than charge, order. Here, using nuclear magnetic resonance, we demonstrate that high magnetic fields actually induce charge order, without spin order, in the CuO2 planes of YBa2Cu3Oy. The observed static, unidirectional, modulation of the charge density breaks translational symmetry, thus explaining quantum oscillation results, and we argue that it is most likely the same 4a-periodic modulation as in stripe-ordered cuprates. The discovery that it develops only when superconductivity fades away and near the same 1/8th hole doping as in La2-xBaxCuO4 suggests that charge order, although visibly pinned by CuO chains in YBa2Cu3Oy, is an intrinsic propensity of the superconducting planes of high Tc cuprates.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1301.2748","kind":"article","title":"Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films","authors":["Shiyong Tan","Yan Zhang","Miao Xia","Zi-Rong Ye","Fei Chen","Xin Xie","Rui Peng","Difei Xu","Qin Fan","Haichao Xu","Juan Jiang","Tong Zhang","Xinchun Lai","Tao Xiang","Jiangping Hu","Binping Xie","D. L. Feng"],"author_count":17,"year":2013,"published":"2013-05-24","venue":"Nature Materials","cited_by":692,"doi":"10.1038/nmat3654","arxiv_id":"1301.2748","nct_id":null,"source_url":"https://doi.org/10.1038/nmat3654","archive_url":"https://space-kitty.com/papers/arxiv:1301.2748","updated":"2013-01-13","pmid":"23708327","pmcid":null,"openalex_id":"W1995037980","pdf_url":"https://arxiv.org/pdf/1301.2748","abstract":"The record of superconducting transition temperature(Tc) has long been 56K for the iron-based high temperature superconductors(Fe-HTS's). Recently, in single layer FeSe films grown on SrTiO3 substrate, signs for a new 65K Tc record are reported. Here with in-situ photoemission measurements, we substantiate the presence of the spin density wave(SDW) in FeSe films, a key ingredient of Fe-HTS that was missed in FeSe before, which weakens with increased thickness or reduced strain. We demonstrate that the superconductivity occurs when the electrons transferred from the oxygen-vacant substrate suppress the otherwise most pronounced SDW in single layer FeSe. Besides providing a comprehensive understanding of FeSe films and directions to further enhance its Tc, we establish the phase diagram of FeSe vs. lattice constant that contains all the essential physics of Fe-HTS's. With the simplest structure, cleanest composition and single tuning parameter, it is ideal for testing theories of Fe-HTS's.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Iron-based superconductors research"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:2307.14819","kind":"article","title":"High-temperature superconductivity with zero-resistance and strange metal behavior in La$_{3}$Ni$_{2}$O$_{7-δ}$","authors":["Yanan Zhang","Dajun Su","Yanen Huang","Zhaoyang Shan","Hualei Sun","Mengwu Huo","Kaixin Ye","Jiawen Zhang","Zihan Yang","Yongkang Xu","Yi Su","Rui Li","Michael Smidman","Meng Wang","Lin Jiao","Huiqiu Yuan"],"author_count":16,"year":2023,"published":"2023-07-27","venue":"Nature Physics 20, 1269-1273 (2024)","cited_by":309,"doi":"10.1038/s41567-024-02515-y","arxiv_id":"2307.14819","nct_id":null,"source_url":"https://arxiv.org/abs/2307.14819","archive_url":"https://space-kitty.com/papers/arxiv:2307.14819","updated":"2024-04-18","pmid":null,"pmcid":null,"openalex_id":"W4399382672","pdf_url":"https://arxiv.org/pdf/2307.14819","abstract":"Recently signatures of superconductivity were observed close to 80 K in \\LN\\ under pressure. This discovery positions \\LN\\ as the first bulk nickelate with high-temperature superconductivity, but the lack of zero resistance presents a significant drawback for validating the findings. Here we report pressure measurements up to over 30 GPa using a liquid pressure medium and show that single crystals of \\LNO\\ do exhibit zero resistance. We find that \\LNO\\ remains metallic under applied pressures, suggesting the absence of a metal-insulator transition proximate to the superconductivity. Analysis of the normal state $T$-linear resistance suggests an intricate link between this strange metal behaviour and superconductivity, whereby at high pressures both the linear resistance coefficient and superconducting transition are slowly suppressed by pressure, while at intermediate pressures both the superconductivity and strange metal behaviour appear disrupted, possibly due to a nearby structural instability. The association between strange metal behaviour and high-temperature superconductivity is very much in line with diverse classes of unconventional superconductors, including the cuprates and Fe-based superconductors. Understanding the superconductivity of \\LNO\\ evidently requires further revealing the interplay of strange metal behaviour, superconductivity, as well as possible competing electronic or structural phases.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con"],"details":null,"provenance":"arxiv+openalex","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1312.1347","kind":"article","title":"Ubiquitous Interplay Between Charge Ordering and High-Temperature Superconductivity in Cuprates","authors":["Eduardo H. da Silva Neto","Pegor Aynajian","Alex Frañó","Riccardo Comin","E. Schierle","E. Weschke","András Gyenis","Jinsheng Wen","John A. Schneeloch","Zhijun Xu","Shimpei Ono","Genda D. Gu","M. Le Tacon","Ali Yazdani"],"author_count":14,"year":2013,"published":"2013-12-20","venue":"Science","cited_by":595,"doi":"10.1126/science.1243479","arxiv_id":"1312.1347","nct_id":null,"source_url":"https://doi.org/10.1126/science.1243479","archive_url":"https://space-kitty.com/papers/arxiv:1312.1347","updated":"2013-12-04","pmid":"24356110","pmcid":null,"openalex_id":"W2095316269","pdf_url":"https://arxiv.org/pdf/1312.1347","abstract":"Besides superconductivity, copper-oxide high temperature superconductors are susceptible to other types of ordering. We use scanning tunneling microscopy and resonant elastic x-ray scattering measurements to establish the formation of charge ordering in the high-temperature superconductor Bi2Sr2CaCu2O8+x. Depending on the hole concentration, the charge ordering in this system occurs with the same period as those found in Y-based or La-based cuprates, and displays the analogous competition with superconductivity. These results indicate the similarity of charge organization competing with superconductivity across different families of cuprates. We observe this charge ordering to leave a distinct electron-hole asymmetric signature (and a broad resonance centered at +20 meV) in spectroscopic measurements, thereby indicating that it is likely related to the organization of holes in a doped Mott insulator.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1011.0050","kind":"article","title":"Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe 1- x Co x ) 2 As 2 above the spin density wave transition","authors":["Ming Yi","Dong-Hui Lu","Jiun‐Haw Chu","James G. Analytis","A. P. Sorini","Alexander F. Kemper","Brian Moritz","Sung‐Kwan Mo","R. G. Moore","Makoto Hashimoto","Wei-Sheng Lee","Z. Hussain","Thomas Devereaux","I. R. Fisher","Zhi‐Xun Shen"],"author_count":15,"year":2011,"published":"2011-04-11","venue":"Proceedings of the National Academy of Sciences","cited_by":515,"doi":"10.1073/pnas.1015572108","arxiv_id":"1011.0050","nct_id":null,"source_url":"https://doi.org/10.1073/pnas.1015572108","archive_url":"https://space-kitty.com/papers/arxiv:1011.0050","updated":"2011-04-12","pmid":null,"pmcid":null,"openalex_id":"W1995064936","pdf_url":"https://arxiv.org/pdf/1011.0050","abstract":"Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high temperature superconductors. Similarly, the new iron-based high temperature superconductors exhibit a tetragonal to orthorhombic structural transition (i.e. a broken C4 symmetry) that either precedes or is coincident with a collinear spin density wave (SDW) transition in undoped parent compounds, and superconductivity arises when both transitions are suppressed via doping. Evidence for strong in-plane anisotropy in the SDW state in this family of compounds has been reported by neutron scattering, scanning tunneling microscopy, and transport measurements. Here we present an angle resolved photoemission spectroscopy study of detwinned single crystals of a representative family of electron-doped iron-arsenide superconductors, Ba(Fe1-xCox)2As2 in the underdoped region. The crystals were detwinned via application of in-plane uniaxial stress, enabling measurements of single domain electronic structure in the orthorhombic state. At low temperatures, our results clearly demonstrate an in-plane electronic anisotropy characterized by a large energy splitting of two orthogonal bands with dominant dxz and dyz character, which is consistent with anisotropy observed by other probes. For compositions x>0, for which the structural transition (TS) precedes the magnetic transition (TSDW), an anisotropic splitting is observed to develop above TSDW, indicating that it is specifically associated with TS. For unstressed crystals, the band splitting is observed close to TS, whereas for stressed crystals the splitting is observed to considerably higher temperatures, revealing the presence of a surprisingly large in-plane nematic susceptibility in the electronic structure.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Iron-based superconductors research"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:0902.1342","kind":"article","title":"Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates","authors":["Takeshi Kondo","Rustem Khasanov","Tsunehiro Takeuchi","Joerg Schmalian","Adam Kaminski"],"author_count":5,"year":2009,"published":"2009-02-09","venue":"Nature 457, 296 (2009)","cited_by":275,"doi":"10.1038/nature07644","arxiv_id":"0902.1342","nct_id":null,"source_url":"https://arxiv.org/abs/0902.1342","archive_url":"https://space-kitty.com/papers/arxiv:0902.1342","updated":"2009-02-09","pmid":null,"pmcid":null,"openalex_id":"W1575429982","pdf_url":"https://arxiv.org/pdf/0902.1342","abstract":"A pairing gap and coherence are the two hallmarks of superconductivity. In a classical BCS superconductor they are established simultaneously at Tc. In the cuprates, however, an energy gap (pseudogap) extends above Tc. The origin of this gap is one of the central issues in high temperature superconductivity. Recent experimental evidence demonstrates that the pseudogap and the superconducting gap are associated with different energy scales. It is however not clear whether they coexist independently or compete. In order to understand the physics of cuprates and improve their superconducting properties it is vital to determine whether the pseudogap is friend or foe of high temperature supercondctivity. Here we report evidence from angle resolved photoemission spectroscopy (ARPES) that the pseudogap and high temperature superconductivity represent two competing orders. We find that there is a direct correlation between a loss in the low energy spectral weight due to the pseudogap and a decrease of the coherent fraction of paired electrons. Therefore, the pseudogap competes with the superconductivity by depleting the spectral weight available for pairing in the region of momentum space where the superconducting gap is largest. This leads to a very unusual state in the underdoped cuprates, where only part of the Fermi surface develops coherence.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con"],"details":null,"provenance":"arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:0806.0203","kind":"article","title":"Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy","authors":["W. D. Wise","M. C. Boyer","Kamalesh Chatterjee","Takeshi Kondo","T. Takeuchi","H. Ikuta","Yayu Wang","E. W. Hudson"],"author_count":8,"year":2008,"published":"2008-06-02","venue":"Nature Physics","cited_by":371,"doi":"10.1038/nphys1021","arxiv_id":"0806.0203","nct_id":null,"source_url":"https://arxiv.org/abs/0806.0203","archive_url":"https://space-kitty.com/papers/arxiv:0806.0203","updated":"2008-06-02","pmid":null,"pmcid":null,"openalex_id":"W1992481770","pdf_url":"https://arxiv.org/pdf/0806.0203","abstract":"One of the main challenges in understanding high TC superconductivity is to disentangle the rich variety of states of matter that may coexist, cooperate, or compete with d-wave superconductivity. At center stage is the pseudogap phase, which occupies a large portion of the cuprate phase diagram surrounding the superconducting dome [1]. Using scanning tunneling microscopy, we find that a static, non-dispersive, \"checkerboard\"-like electronic modulation exists in a broad regime of the cuprate phase diagram and exhibits strong doping dependence. The continuous increase of checkerboard periodicity with hole density strongly suggests that the checkerboard originates from charge density wave formation in the anti-nodal region of the cuprate Fermi surface. These results reveal a coherent picture for static electronic orderings in the cuprates and shed important new light on the nature of the pseudogap phase.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.str-el","cond-mat.supr-con"],"details":null,"provenance":"arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1011.3500","kind":"article","title":"Twisted Hubbard Model for Sr2IrO4: Magnetism and Possible High Temperature Superconductivity","authors":["Fa Wang","T. Senthil"],"author_count":2,"year":2010,"published":"2010-11-15","venue":"Phys. Rev. Lett. 106, 136402 (2011)","cited_by":468,"doi":"10.1103/physrevlett.106.136402","arxiv_id":"1011.3500","nct_id":null,"source_url":"https://arxiv.org/abs/1011.3500","archive_url":"https://space-kitty.com/papers/arxiv:1011.3500","updated":"2010-11-17","pmid":"21517402","pmcid":null,"openalex_id":"W1990907627","pdf_url":"https://arxiv.org/pdf/1011.3500","abstract":"Sr2IrO4 has been suggested as a Mott insulator from a single J_eff=1/2 band, similar to the cuprates. However this picture is complicated by the measured large magnetic anisotropy and ferromagnetism. Based on a careful mapping to the J_eff=1/2 (pseudospin-1/2) space, we propose that the low energy electronic structure of Sr2IrO4 can indeed be described by a SU(2) invariant pseudospin-1/2 Hubbard model very similar to that of the cuprates, but with a \"twisted\" coupling to external magnetic field (a g-tensor with a staggered antisymmetric component). This perspective naturally explains the magnetic properties of Sr2IrO4. We also derive several simple facts based on this mapping and the known results about the Hubbard model and the cuprates, which may be tested in future experiments on Sr2IrO4. In particular we propose that (electron-)doping Sr2IrO4 can potentially realize high-temperature superconductivity.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.str-el","cond-mat.supr-con"],"details":null,"provenance":"arxiv+openalex","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1106.2641","kind":"article","title":"Intense paramagnon excitations in a large family of high-temperature superconductors","authors":["M. Le Tacon","Giacomo Claudio Ghiringhelli","Jiří Chaloupka","M. Moretti Sala","V. Hinkov","M. W. Haverkort","M. Minola","M. Bakr","Ke‐Jin Zhou","S. Blanco-Canosa","Claude Monney","Yujie Song","G. L. Sun","Chengtian T. Lin","G. M. De Luca","M. Salluzzo","Giniyat Khaliullin","Thorsten Schmitt","L. Braicovich","B. Keimer"],"author_count":20,"year":2011,"published":"2011-07-10","venue":"Nature Physics","cited_by":453,"doi":"10.1038/nphys2041","arxiv_id":"1106.2641","nct_id":null,"source_url":"https://doi.org/10.1038/nphys2041","archive_url":"https://space-kitty.com/papers/arxiv:1106.2641","updated":"2011-06-14","pmid":null,"pmcid":null,"openalex_id":"W1998488271","pdf_url":"https://arxiv.org/pdf/1106.2641","abstract":"In the search for the mechanism of high-temperature superconductivity, intense research has been focused on the evolution of the spin excitation spectrum upon doping from the antiferromagnetic insulating to the superconducting states of the cuprates. Because of technical limitations, the experimental investigation of doped cuprates has been largely focused on low-energy excitations in a small range of momentum space. Here we use resonant inelastic x-ray scattering to show that a large family of superconductors, encompassing underdoped YBa$_2$Cu$_4$O$_8$ and overdoped YBa$_2$Cu$_3$O$_{7}$, exhibits damped spin excitations (paramagnons) with dispersions and spectral weights closely similar to those of magnons in undoped cuprates. %The results are in excellent agreement with the spin excitations obtained by exact diagonalization of the $\\bf t-J$ Hamiltonian on finite-sized clusters. The comprehensive experimental description of this surprisingly simple spectrum permits quantitative tests of magnetic Cooper pairing models. A numerical solution of the Eliashberg equations for the magnetic spectrum of YBa$_2$Cu$_3$O$_{7}$ reproduces its superconducting transition temperature within a factor of two, a level of agreement comparable to Eliashberg theories of conventional superconductors.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1207.3558","kind":"article","title":"Superconductivity in Novel BiS 2 -Based Layered Superconductor LaO 1- x F x BiS 2","authors":["Yoshikazu Mizuguchi","Satoshi Demura","Keita Deguchi","Yoshihiko Takano","Hiroshi Fujihisa","Yoshito Gotoh","Hiroki Izawa","Osuke Miura"],"author_count":8,"year":2012,"published":"2012-11-04","venue":"Journal of the Physical Society of Japan","cited_by":429,"doi":"10.1143/jpsj.81.114725","arxiv_id":"1207.3558","nct_id":null,"source_url":"https://doi.org/10.1143/jpsj.81.114725","archive_url":"https://space-kitty.com/papers/arxiv:1207.3558","updated":"2012-12-14","pmid":null,"pmcid":null,"openalex_id":"W1619775113","pdf_url":"https://arxiv.org/pdf/1207.3558","abstract":"Layered superconductors have provided some interesting fields in condensed matter physics owing to the low dimensionality of their electronic states. For example, the high-Tc (high transition temperature) cuprates and the Fe-based superconductors possess a layered crystal structure composed of a stacking of spacer (blocking) layers and conduction (superconducting) layers, CuO2 planes or Fe-Anion layers. The spacer layers provide carriers to the conduction layers and induce exotic superconductivity. Recently, we have reported superconductivity in the novel BiS2-based layered compound Bi4O4S3. It was found that superconductivity of Bi4O4S3 originates from the BiS2 layers. The crystal structure is composed of a stacking of BiS2 superconducting layers and the spacer layers, which resembles those of high-Tc cuprate and the Fe-based superconductors. Here we report a discovery of a new type of BiS2-based layered superconductor LaO1-xFxBiS2, with a Tc as high as 10.6 K.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Iron-based superconductors research"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1511.08162","kind":"article","title":"Change of carrier density at the pseudogap critical point of a cuprate superconductor","authors":["S. Badoux","Wojciech Tabiś","F. Laliberté","G. Grissonnanche","Baptiste Vignolle","David Vignolles","J. Béard","D. A. Bonn","W. N. Hardy","Ruixing Liang","N. Doiron-Leyraud","Louis Taillefer","Cyril Proust"],"author_count":13,"year":2016,"published":"2016-02-19","venue":"Nature","cited_by":400,"doi":"10.1038/nature16983","arxiv_id":"1511.08162","nct_id":null,"source_url":"https://doi.org/10.1038/nature16983","archive_url":"https://space-kitty.com/papers/arxiv:1511.08162","updated":"2015-11-25","pmid":"26901870","pmcid":null,"openalex_id":"W2172725033","pdf_url":"https://arxiv.org/pdf/1511.08162","abstract":"The pseudogap is a central puzzle of cuprate superconductors. Its connection to the Mott insulator at low doping $p$ remains ambiguous and its relation to the charge order that reconstructs the Fermi surface at intermediate $p$ is still unclear. Here we use measurements of the Hall coefficient in magnetic fields up to 88 T to show that Fermi-surface reconstruction by charge order in YBa$_2$Cu$_3$O$_y$ ends sharply at a critical doping $p = 0.16$, distinctly lower than the pseudogap critical point at $p^* = 0.19$. This shows that pseudogap and charge order are separate phenomena. We then find that the change of carrier density from $n = 1 + p$ in the conventional metal at high p to $n = p$ at low $p$ - a signature of the lightly doped cuprates - starts at $p^*$. This shows that pseudogap and antiferromagnetic Mott insulator are linked.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:cond-mat/0511334","kind":"article","title":"Pseudogap and high-temperature superconductivity from weak to strong coupling. Towards quantitative theory","authors":["A. -M. S. Tremblay","B. Kyung","D. Sénéchal"],"author_count":3,"year":2005,"published":"2005-11-14","venue":"Low Temperature Physics, 32, 424-451 (2006) [Fizika Nizkikh Temperatur, 32, 561-595 (2006)]","cited_by":196,"doi":"10.1063/1.2199446","arxiv_id":"cond-mat/0511334","nct_id":null,"source_url":"https://arxiv.org/abs/cond-mat/0511334","archive_url":"https://space-kitty.com/papers/arxiv:cond-mat/0511334","updated":"2006-04-06","pmid":null,"pmcid":null,"openalex_id":"W1617435136","pdf_url":"https://arxiv.org/pdf/cond-mat/0511334","abstract":"This is a short review of the theoretical work on the two-dimensional Hubbard model performed in Sherbrooke in the last few years. It is written on the occasion of the twentieth anniversary of the discovery of high-temperature superconductivity. We discuss several approaches, how they were benchmarked and how they agree sufficiently with each other that we can trust that the results are accurate solutions of the Hubbard model. Then comparisons are made with experiment. We show that the Hubbard model does exhibit d-wave superconductivity and antiferromagnetism essentially where they are observed for both hole and electron-doped cuprates. We also show that the pseudogap phenomenon comes out of these calculations. In the case of electron-doped high temperature superconductors, comparisons with angle-resolved photoemission experiments are nearly quantitative. The value of the pseudogap temperature observed for these compounds in recent photoemission experiments has been predicted by theory before it was observed experimentally. Additional experimental confirmation would be useful. The theoretical methods that are surveyed include mostly the Two-Particle Self-Consistent Approach, Variational Cluster Perturbation Theory (or variational cluster approximation), and Cellular Dynamical Mean-Field Theory.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con","cond-mat.str-el"],"details":null,"provenance":"arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1506.07910","kind":"article","title":"Three-dimensional charge density wave order in YBa 2 Cu 3 O 6.67 at high magnetic fields","authors":["Simon Gerber","Hoyoung Jang","Hiroyuki Nojiri","Satoshi Matsuzawa","H. Yasumura","D. A. Bonn","Ruixing Liang","W. N. Hardy","Z. Islam","Apurva Mehta","Sanghoon Song","Marcin Sikorski","D. Stefanescu","Yiping Feng","Steven Allan Kivelson","Thomas Devereaux","Zhi‐Xun Shen","C.-C. Kao","Wei-Sheng Lee","Diling Zhu","Jun‐Sik Lee"],"author_count":21,"year":2015,"published":"2015-11-05","venue":"Science","cited_by":366,"doi":"10.1126/science.aac6257","arxiv_id":"1506.07910","nct_id":null,"source_url":"https://doi.org/10.1126/science.aac6257","archive_url":"https://space-kitty.com/papers/arxiv:1506.07910","updated":"2015-06-25","pmid":"26541608","pmcid":null,"openalex_id":"W1776536844","pdf_url":"https://arxiv.org/pdf/1506.07910","abstract":"Charge density wave (CDW) correlations have recently been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct from that measured by x-ray scattering at zero and low fields. Here we combine a pulsed magnet with an x-ray free electron laser to characterize the CDW in YBa2Cu3O6.67 via x-ray scattering in fields up to 28 Tesla. While the zero-field CDW order, which develops below T ~ 150 K, is essentially two-dimensional, at lower temperature and beyond 15 Tesla, another three-dimensionally ordered CDW emerges. The field-induced CDW onsets around the zero-field superconducting transition temperature, yet the incommensurate in-plane ordering vector is field-independent. This implies that the two forms of CDW and high-temperature superconductivity are intimately linked.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:cond-mat/9702112","kind":"article","title":"Non-Fermi-liquid behavior and d-wave superconductivity near the charge-density-wave quantum critical point","authors":["C. Castellani","C. Di Castro","M. Grilli"],"author_count":3,"year":1997,"published":"1997-02-12","venue":"Zeitschrift für Physik B Condensed Matter","cited_by":179,"doi":"10.1007/s002570050347","arxiv_id":"cond-mat/9702112","nct_id":null,"source_url":"https://arxiv.org/abs/cond-mat/9702112","archive_url":"https://space-kitty.com/papers/arxiv:cond-mat/9702112","updated":"1997-02-12","pmid":null,"pmcid":null,"openalex_id":"W2127824335","pdf_url":"https://arxiv.org/pdf/cond-mat/9702112","abstract":"A scenario is presented, in which the presence of a quantum critical point due to formation of incommensurate charge density waves accounts for the basic features of the high temperature superconducting cuprates, both in the normal and in the superconducting states. Specifically, the singular interaction arising close to this charge-driven quantum critical point gives rise to the non-Fermi liquid behavior universally found at optimal doping. This interaction is also responsible for d-wave Cooper pair formation with a superconducting critical temperature strongly dependent on doping in the overdoped region and with a plateau in the optimally doped region. In the underdoped region a temperature dependent pairing potential favors local pair formation without superconducting coherence, with a peculiar temperature dependence of the pseudogap and a non-trivial relation between the pairing temperature and the gap itself. This last property is in good qualitative agreement with so far unexplained features of the experiments.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con"],"details":null,"provenance":"arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1503.00391","kind":"article","title":"Energy gaps in high-transition-temperature cuprate superconductors","authors":["Makoto Hashimoto","Inna Vishik","Ruihua He","Thomas Devereaux","Zhi‐Xun Shen"],"author_count":5,"year":2014,"published":"2014-06-30","venue":"Nature Physics","cited_by":338,"doi":"10.1038/nphys3009","arxiv_id":"1503.00391","nct_id":null,"source_url":"https://doi.org/10.1038/nphys3009","archive_url":"https://space-kitty.com/papers/arxiv:1503.00391","updated":"2015-03-02","pmid":null,"pmcid":null,"openalex_id":"W1964814689","pdf_url":"https://arxiv.org/pdf/1503.00391","abstract":"The spectral energy gap is an important signature that defines states of quantum matter: insulators, density waves, and superconductors have very different gap structures. The momentum resolved nature of angle-resolved photoemission spectroscopy (ARPES) makes it a powerful tool to characterize spectral gaps. ARPES has been instrumental in establishing the anisotropic d-wave structure of the superconducting gap in high-transition temperature (Tc) cuprates, which is different from the conventional isotropic s-wave superconducting gap. Shortly afterwards, ARPES demonstrated that an anomalous gap above Tc, often termed the pseudogap, follows a similar anisotropy. The nature of this poorly understood pseudogap and its relationship with superconductivity has since become the focal point of research in the field. To address this issue, the momentum, temperature, doping, and materials dependence of spectral gaps have been extensively examined with significantly improved instrumentation and carefully matched experiments in recent years. This article overviews the current understanding and unresolved issues of the basic phenomenology of gap hierarchy. We show how ARPES has been sensitive to phase transitions, has distinguished between orders having distinct broken electronic symmetries, and has uncovered rich momentum and temperature dependent fingerprints reflecting an intertwined & competing relationship between the ordered states and superconductivity that results in multiple phenomenologically-distinct ground states inside the superconducting dome. These results provide us with microscopic insights into the cuprate phase diagram.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:2109.09726","kind":"article","title":"Superconductivity in a quintuple-layer square-planar nickelate","authors":["Grace A. Pan","Dan Ferenc Segedin","Harrison LaBollita","Qi Song","Emilian M. Nica","Berit Hansen Goodge","Andrew T. Pierce","Spencer Doyle","Steve Novakov","Denisse Córdova Carrizales","Alpha T. N’Diaye","Padraic Shafer","Hanjong Paik","John T. Heron","Jarad A. Mason","Amir Yacoby","Lena Fitting Kourkoutis","Onur Erten","Charles M. Brooks","Antía S. Botana","Julia A. Mundy"],"author_count":21,"year":2021,"published":"2021-11-22","venue":"Nature Materials","cited_by":299,"doi":"10.1038/s41563-021-01142-9","arxiv_id":"2109.09726","nct_id":null,"source_url":"https://doi.org/10.1038/s41563-021-01142-9","archive_url":"https://space-kitty.com/papers/arxiv:2109.09726","updated":"2021-09-20","pmid":"34811494","pmcid":null,"openalex_id":"W3199601026","pdf_url":"https://arxiv.org/pdf/2109.09726","abstract":"Since the discovery of high-temperature superconductivity in the copper oxide materials, there have been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials. One prime materials platform has been the rare-earth nickelates and indeed superconductivity was recently discovered in the doped compound Nd$_{0.8}$Sr$_{0.2}$NiO$_2$. Undoped NdNiO$_2$ belongs to a series of layered square-planar nickelates with chemical formula Nd$_{n+1}$Ni$_n$O$_{2n+2}$ and is known as the 'infinite-layer' ($n = \\infty$) nickelate. Here, we report the synthesis of the quintuple-layer ($n = 5$) member of this series, Nd$_6$Ni$_5$O$_{12}$, in which optimal cuprate-like electron filling ($d^{8.8}$) is achieved without chemical doping. We observe a superconducting transition beginning at $\\sim$13 K. Electronic structure calculations, in tandem with magnetoresistive and spectroscopic measurements, suggest that Nd$_6$Ni$_5$O$_{12}$ interpolates between cuprate-like and infinite-layer nickelate-like behavior. In engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors which can be tuned via both doping and dimensionality.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1103.2329","kind":"article","title":"From a Single-Band Metal to a High-Temperature Superconductor via Two Thermal Phase Transitions","authors":["Ruihua He","Makoto Hashimoto","Hovnatan Karapetyan","J. D. Koralek","James P. Hinton","J. P. Testaud","V. Nathan","Yoshiyuki Yoshida","Hong Yao","Kiyohisa Tanaka","W. Meevasana","R. G. Moore","Dong-Hui Lu","Sung‐Kwan Mo","M. Ishikado","Hiroshi Eisaki","Z. Hussain","Thomas Devereaux","Steven Allan Kivelson","J. Orenstein","A. Kapitulnik","Zhi‐Xun Shen"],"author_count":22,"year":2011,"published":"2011-03-24","venue":"Science","cited_by":334,"doi":"10.1126/science.1198415","arxiv_id":"1103.2329","nct_id":null,"source_url":"https://doi.org/10.1126/science.1198415","archive_url":"https://space-kitty.com/papers/arxiv:1103.2329","updated":"2011-03-11","pmid":"21436447","pmcid":null,"openalex_id":"W2103714664","pdf_url":"https://arxiv.org/pdf/1103.2329","abstract":"The nature of the pseudogap phase of cuprate high-temperature superconductors is a major unsolved problem in condensed matter physics. We studied the commencement of the pseudogap state at temperature T* using three different techniques (angle-resolved photoemission spectroscopy, polar Kerr effect, and time-resolved reflectivity) on the same optimally-doped Bi2201 crystals. We observed the coincident, abrupt onset at T* of a particle-hole asymmetric antinodal gap in the electronic spectrum, a Kerr rotation in the reflected light polarization, and a change in the ultrafast relaxational dynamics, consistent with a phase transition. Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature (Tc), entangled in an energy-momentum-dependent fashion with the pre-existing pseudogap features, ushering in a ground state with coexisting orders.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:2311.07353","kind":"article","title":"Superconductivity in pressurized trilayer La4Ni3O10−δ single crystals","authors":["Yinghao Zhu","Di Peng","Enkang Zhang","Bingying Pan","Chen Xu","Lixing Chen","Huifen Ren","Feiyang Liu","Yiqing Hao","Nana Li","Zhenfang Xing","Fujun Lan","Jiyuan Han","Junjie Wang","Donghan Jia","Hongliang Wo","Yiqing Gu","Yimeng Gu","Ji Li","Wenbin Wang","Huiyang Gou","Yao Shen","Tianping Ying","Xiaolong Chen","Wenge Yang"],"author_count":30,"year":2024,"published":"2024-07-17","venue":"Nature","cited_by":260,"doi":"10.1038/s41586-024-07553-3","arxiv_id":"2311.07353","nct_id":null,"source_url":"https://doi.org/10.1038/s41586-024-07553-3","archive_url":"https://space-kitty.com/papers/arxiv:2311.07353","updated":"2024-07-09","pmid":"39020034","pmcid":null,"openalex_id":"W4400730539","pdf_url":"https://arxiv.org/pdf/2311.07353","abstract":"The pursuit of discovering new high-temperature superconductors that diverge from the copper-based paradigm1-3 carries profound implications for elucidating mechanisms behind superconductivity and may also enable new applications4-8. Here, our investigation reveals that application of pressure effectively suppresses the spin and charge order in trilayer nickelate La4Ni3O10-δ single crystals, leading to the emergence of superconductivity with a maximum critical temperature (Tc) of around 30 K at 69.0 GPa. The DC susceptibility measurements confirm a substantial diamagnetic response below Tc, indicating the presence of bulk superconductivity with a volume fraction exceeding 80%. In the normal state, we observe a \"strange metal\" behavior, characterized by a linear temperature-dependent resistance extending up to 300 K. Furthermore, the layer-dependent superconductivity observed hints at a unique interlayer coupling mechanism specific to nickelates, setting them apart from cuprates in this regard. Our findings provide crucial insights into the fundamental mechanisms underpinning superconductivity, while also introducing a new material platform to explore the intricate interplay between the spin/charge order, flat band structures, interlayer coupling, strange metal behavior and high-temperature superconductivity.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by-nc-nd","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1509.05002","kind":"article","title":"Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor","authors":["Gaetano Campi","Antonio Bianconi","Nicola Poccia","Ginestra Bianconi A","Luisa Barba","Gianmichele Arrighetti","Davide Innocenti","J. Karpiński","N. D. Zhigadlo","Sergey M. Kazakov","Manfred C. Burghammer","Martin v. Zimmermann","Michael Sprung","Alessandro Ricci"],"author_count":14,"year":2015,"published":"2015-09-01","venue":"Nature","cited_by":314,"doi":"10.1038/nature14987","arxiv_id":"1509.05002","nct_id":null,"source_url":"https://doi.org/10.1038/nature14987","archive_url":"https://space-kitty.com/papers/arxiv:1509.05002","updated":"2015-09-16","pmid":"26381983","pmcid":null,"openalex_id":"W1893619836","pdf_url":"https://arxiv.org/pdf/1509.05002","abstract":"It has recently been established that the high temperature (high-Tc) superconducting state coexists with short-range charge-density-wave order and quenched disorder arising from dopants and strain. This complex, multiscale phase separation invites the development of theories of high temperature superconductivity that include complexity. The nature of the spatial interplay between charge and dopant order that provides a basis for nanoscale phase separation remains a key open question, because experiments have yet to probe the unknown spatial distribution at both the nanoscale and mescoscale (between atomic and macroscopic scale). Here we report micro X-ray diffraction imaging of the spatial distribution of both the charge-density-wave puddles (domains with only a few wavelengths) and quenched disorder in HgBa2CuO4+y, the single layer cuprate with the highest Tc, 95 kelvin. We found that the charge-density-wave puddles, like the steam bubbles in boiling water, have a fat-tailed size distribution that is typical of self-organization near a critical point. However, the quenched disorder, which arises from oxygen interstitials, has a distribution that is contrary to the usual assumed random, uncorrelated distribution. The interstitials-oxygen-rich domains are spatially anti-correlated with the charge-density-wave domains, leading to a complex emergent geometry of the spatial landscape for superconductivity.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."},{"id":"arxiv:1910.08931","kind":"article","title":"Absence of Superconductivity in the Pure Two-Dimensional Hubbard Model","authors":["Mingpu Qin","Chia-Min Chung","Hao Shi","Ettore Vitali","Claudius Hubig","Ulrich Schollwöck","Steven R. White","Shiwei Zhang"],"author_count":8,"year":2020,"published":"2020-07-21","venue":"Physical Review X","cited_by":298,"doi":"10.1103/physrevx.10.031016","arxiv_id":"1910.08931","nct_id":null,"source_url":"https://doi.org/10.1103/physrevx.10.031016","archive_url":"https://space-kitty.com/papers/arxiv:1910.08931","updated":"2020-07-22","pmid":null,"pmcid":null,"openalex_id":"W3044148120","pdf_url":"http://link.aps.org/pdf/10.1103/PhysRevX.10.031016","abstract":"We study the superconducting pairing correlations in the ground state of the doped Hubbard model -- in its original form without hopping beyond nearest neighbor or other perturbing parameters -- in two dimensions at intermediate to strong coupling and near optimal doping. The nature of such correlations has been a central question ever since the discovery of cuprate high-temperature superconductors. Despite unprecedented effort and tremendous progress in understanding the properties of this fundamental model, a definitive answer to whether the ground state is superconducting in the parameter regime most relevant to cuprates has proved exceedingly difficult to establish. In this work, we employ two complementary, state-of-the-art many-body computational methods, constrained path (CP) auxiliary-field quantum Monte Carlo (AFQMC) and density matrix renormalization group (DMRG) methods, deploying the most recent algorithmic advances in each. Systematic and detailed comparisons between the two methods are performed. The DMRG is extremely reliable on small width cylinders, where we use it to validate the AFQMC. The AFQMC is then used to study wide systems as well as fully periodic systems, to establish that we have reached the thermodynamic limit. The ground state is found to be non-superconducting in the moderate to strong coupling regime in the vicinity of optimal hole doping.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Physics of Superconductivity and Magnetism"],"details":null,"provenance":"openalex+arxiv","attribution":"Abstract: arXiv descriptive metadata (CC0). Thank you to arXiv for use of its open access interoperability. This service was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv."}],"next":"https://space-kitty.com/api/v1/topics/cuprate-mechanism/papers?sort=top&limit=25&offset=25"}