{"topic":"room-temperature-claims","sort":"top","limit":25,"offset":0,"count":25,"papers":[{"id":"arxiv:1901.04001","kind":"article","title":"Superconductivity in sodalite-like yttrium hydride clathrates","authors":["Christoph Heil","Simone Di Cataldo","Giovanni B. Bachelet","Lilia Boeri"],"author_count":4,"year":2019,"published":"2019-06-10","venue":"Physical review. B./Physical review. B","cited_by":154,"doi":"10.1103/physrevb.99.220502","arxiv_id":"1901.04001","nct_id":null,"source_url":"https://doi.org/10.1103/physrevb.99.220502","archive_url":"https://space-kitty.com/papers/arxiv:1901.04001","updated":"2019-01-13","pmid":null,"pmcid":null,"openalex_id":"W2951365496","pdf_url":"https://arxiv.org/pdf/1901.04001","abstract":"We report ab-initio calculations of the superconducting properties of two high-Tc sodalite-like clathrate yttrium hydrides, YH6 and YH10, within the fully anisotropic ME theory, including Coulomb corrections. For both compounds we find almost isotropic superconducting gaps, resulting from a uniform distribution of the electron-phonon coupling over phonon modes and electronic states of mixed Y and H character. The Coulomb screening is rather weak, resulting in a Morel-Anderson pseudopotential mu*= 0:11, at odds with claims of unusually large Tc in lanthanum hydrides. The corresponding critical temperatures at 300 GPa exceed room temperature (Tc = 290 K and 310 K for YH6 and YH10), in agreement with a previous isotropic-gap calculation. The different response of these two compounds to external pressure, along with a comparison to low-Tc superconducting YH3, may inspire strategies to improve the superconducting properties of this class of hydrides.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"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:10.1063/5.0002104","kind":"article","title":"Everything you always wanted to know about metallic hydrogen but were afraid to ask","authors":["Eugene Gregoryanz","Cheng Ji","Philip Dalladay‐Simpson","Bing Li","Ross T. Howie","Ho‐kwang Mao"],"author_count":6,"year":2020,"published":"2020-04-23","venue":"Matter and Radiation at Extremes","cited_by":89,"doi":"10.1063/5.0002104","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1063/5.0002104","archive_url":"https://space-kitty.com/papers/doi:10.1063/5.0002104","updated":null,"pmid":null,"pmcid":null,"openalex_id":"W3019217361","pdf_url":null,"abstract":"The hydrogen molecule is made from the first and lightest element in the periodic table. When hydrogen gas is either compressed or cooled, it forms the simplest molecular solid. This solid exhibits many interesting and fundamental physical phenomena. It is believed that if the density of the solid is increased by compressing it to very high pressures, hydrogen will transform into the lightest known metal with very unusual and fascinating properties, such as room temperature superconductivity and/or superfluidity. In this article, we provide a critical look at the numerous claims of hydrogen metallization and the current experimental state of affairs.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Everything you always wanted to know about metallic hydrogen but were afraid to ask\" by Eugene Gregoryanz, Cheng Ji, Philip Dalladay‐Simpson et al., https://doi.org/10.1063/5.0002104, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified."},{"id":"arxiv:2104.03710","kind":"article","title":"Absence of conventional room-temperature superconductivity at high pressure in carbon-doped H3S","authors":["Tianchun Wang","Motoaki Hirayama","Takuya Nomoto","Takashi Koretsune","Ryotaro Arita","José A. Flores‐Livas"],"author_count":6,"year":2021,"published":"2021-08-25","venue":"Physical review. B./Physical review. B","cited_by":54,"doi":"10.1103/physrevb.104.064510","arxiv_id":"2104.03710","nct_id":null,"source_url":"https://doi.org/10.1103/physrevb.104.064510","archive_url":"https://space-kitty.com/papers/arxiv:2104.03710","updated":"2021-04-12","pmid":null,"pmcid":null,"openalex_id":"W3145341292","pdf_url":"https://arxiv.org/pdf/2104.03710","abstract":"In this work, we show that the same theoretical tools that successfully explain other hydrides systems under pressure seem to be at odds with the recently claimed conventional room temperature superconductivity of the carbonaceous sulfur hydride. We support our conclusions with I) the absence of a dominant low-enthalpy stoichiometry and crystal structure in the ternary phase diagram. II) Only the thermodynamics of C-doping phases appears to be marginally competing in enthalpy against H$_3$S. III) Accurate results of the transition temperature given by ab initio Migdal-Eliashberg calculations differ by more than 110 K to recently theoretical claims explaining the high-temperature superconductivity in carbonaceous-hydrogen sulfide. A novel mechanism of superconductivity or a breakdown of current theories in this system is possibly behind the disagreement.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"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:2307.12008","kind":"preprint","title":"The First Room-Temperature Ambient-Pressure Superconductor","authors":["Sukbae Lee","Ji-Hoon Kim","Young-Wan Kwon"],"author_count":3,"year":2023,"published":"2023-07-22","venue":null,"cited_by":52,"doi":null,"arxiv_id":"2307.12008","nct_id":null,"source_url":"https://arxiv.org/abs/2307.12008","archive_url":"https://space-kitty.com/papers/arxiv:2307.12008","updated":"2023-07-22","pmid":null,"pmcid":null,"openalex_id":"W4385245555","pdf_url":"https://arxiv.org/pdf/2307.12008","abstract":"For the first time in the world, we succeeded in synthesizing the room-temperature superconductor ($T_c \\ge 400$ K, 127$^\\circ$C) working at ambient pressure with a modified lead-apatite (LK-99) structure. The superconductivity of LK-99 is proved with the Critical temperature ($T_c$), Zero-resistivity, Critical current ($I_c$), Critical magnetic field ($H_c$), and the Meissner effect. The superconductivity of LK-99 originates from minute structural distortion by a slight volume shrinkage (0.48 %), not by external factors such as temperature and pressure. The shrinkage is caused by Cu$^{2+}$ substitution of Pb$^{2+}$(2) ions in the insulating network of Pb(2)-phosphate and it generates the stress. It concurrently transfers to Pb(1) of the cylindrical column resulting in distortion of the cylindrical column interface, which creates superconducting quantum wells (SQWs) in the interface. The heat capacity results indicated that the new model is suitable for explaining the superconductivity of LK-99. The unique structure of LK-99 that allows the minute distorted structure to be maintained in the interfaces is the most important factor that LK-99 maintains and exhibits superconductivity at room temperatures and ambient pressure.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":false,"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:2307.16402","kind":"article","title":"Synthesis of possible room temperature superconductor LK-99:Pb$_9$Cu(PO$_4$)$_6$O","authors":["Kapil Kumar","N. K. Karn","V. P. S. Awana"],"author_count":3,"year":2023,"published":"2023-07-31","venue":"Superconductor Science and Technology 36, 10LT02 (2023)","cited_by":39,"doi":"10.1088/1361-6668/acf002","arxiv_id":"2307.16402","nct_id":null,"source_url":"https://arxiv.org/abs/2307.16402","archive_url":"https://space-kitty.com/papers/arxiv:2307.16402","updated":"2023-08-26","pmid":null,"pmcid":null,"openalex_id":"W4385799860","pdf_url":"https://arxiv.org/pdf/2307.16402","abstract":"The quest for room-temperature superconductors has been teasing scientists and physicists, since its inception in 1911 itself. Several assertions have already been made about room temperature superconductivity but were never verified or reproduced across the labs. The cuprates were the earliest high transition temperature superconductors, and it seems that copper has done the magic once again. Last week, a Korean group synthesized a Lead Apatite-based compound LK-99, showing a T$_c$ of above 400$^\\circ$K. The signatures of superconductivity in the compound are very promising, in terms of resistivity (R = 0) and diamagnetism at T$_c$. Although, the heat capacity (C$_p$) did not show the obvious transition at T$_c$. Inspired by the interesting claims of above room temperature superconductivity in LK-99, in this article, we report the synthesis of polycrystalline samples of LK-99, by following the same heat treatment as reported in [1,2] by the two-step precursor method. The phase is confirmed through X-ray diffraction (XRD) measurements, performed after each heat treatment. The room temperature diamagnetism is not evidenced by the levitation of a permanent magnet over the sample or vice versa. Further measurements for the confirmation of bulk superconductivity on variously synthesized samples are underway. Our results on the present LK-99 sample, being synthesized at 925$^\\circ$C, as of now do not approve the appearance of bulk superconductivity at room temperature. Further studies with different heat treatments are though, yet underway.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con","cond-mat.mtrl-sci","cond-mat.str-el"],"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:2303.08759","kind":"article","title":"Absence of near-ambient superconductivity in LuH$_{2\\pm\\text{x}}$N$_y$","authors":["Xue Ming","Ying-Jie Zhang","Xiyu Zhu","Qing Li","Chengping He","Yuecong Liu","Bo Zheng","Huan Yang","Hai-Hu Wen"],"author_count":9,"year":2023,"published":"2023-03-15","venue":"Nature 620, 72-77 (2023)","cited_by":87,"doi":"10.1038/s41586-023-06162-w","arxiv_id":"2303.08759","nct_id":null,"source_url":"https://arxiv.org/abs/2303.08759","archive_url":"https://space-kitty.com/papers/arxiv:2303.08759","updated":"2023-06-02","pmid":"37168015","pmcid":null,"openalex_id":"W4376134769","pdf_url":"https://arxiv.org/pdf/2303.08759","abstract":"Recently near-ambient superconductivity was claimed in N-doped lutetium hydride (ref. 1). This induces a worldwide fanaticism about the dream of room temperature superconductivity under low pressures. By using a high pressure and high temperature synthesis technique, we have successfully obtained the nitrogen doped lutetium hydride (LuH$_{2\\pm\\text{x}}$N$_y$) with a dark-bluish color and a structure with the space group of $Fm\\bar{3}m$ evidenced by x-ray diffraction. This structure is the same as that reported in ref. 1. The energy dispersive X-ray spectroscopy (EDS) confirmed the existence of nitrogen in some areas of the samples. At ambient pressure, we witness a kink of resistivity and magnetization at about 300 K, which may correspond to a rearrangement of hydrogen/nitrogen atoms, namely a structural transition. However, by applying a pressure from 1 GPa to 6 GPa, we have seen a progressively optimized metallic behavior without showing superconductivity down to 10 K. Temperature dependence of magnetization shows a roughly flat feature between 100 and 320 K, and the magnetization increases with magnetic field at 100 K, all these are not expected for superconductivity at 100 K. Thus, we conclude the absence of near-ambient superconductivity in this nitrogen-doped lutetium hydride under pressures below 6 GPa.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","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":"doi:10.1088/2053-1583/ad2523","kind":"article","title":"Superconductivity and electron self-energy in tungsten-sulfur-hydride monolayer","authors":["Jakkapat Seeyangnok","M M Ul Hassan","Udomsilp Pinsook","Graeme J. Ackland"],"author_count":4,"year":2024,"published":"2024-02-02","venue":"2D Materials","cited_by":29,"doi":"10.1088/2053-1583/ad2523","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1088/2053-1583/ad2523","archive_url":"https://space-kitty.com/papers/doi:10.1088/2053-1583/ad2523","updated":null,"pmid":null,"pmcid":null,"openalex_id":"W4391465173","pdf_url":null,"abstract":"Abstract Hydrogen-rich structures have recently gained attention as a candidate for room-temperature superconductors. Hydrogen has high phonon frequencies and can be an ideal component for superconductors if it also exhibits strong electron–phonon coupling. In bulk materials, this has been achieved only under very high pressure. Two-dimensional hydrogen-decorated materials can also be expected to become superconductors. Recently, it was shown that a Janus MoSH monolayer can be synthesized (Lu et al 2017 Nat. Nanotechnol. 12 744–9), and a theoretical investigation of this MoSH monolayer claimed that T c = 28.58 K at atmospheric pressure (Liu et al 2022 Phys. Rev. B 105 245420). In this work, we propose that tungsten sulfur hydride (WSH) is also a superconducting Janus monolayer. The T c is carefully calculated with very high resolution via the Eliashberg spectral function and the electron self-energy. We find that WSH is a conventional BCS superconductor with T c = 12.2 K at ambient pressure. For practical applications, sensitive dependence on substrate is inferred. We also reported the electron self-energy of WSH, which can be compared directly with future measurements from angle-resolved photoelectron spectroscopy.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["2D Materials and Applications"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Superconductivity and electron self-energy in tungsten-sulfur-hydride monolayer\" by Jakkapat Seeyangnok, M M Ul Hassan, Udomsilp Pinsook et al., https://doi.org/10.1088/2053-1583/ad2523, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified."},{"id":"arxiv:2308.03544","kind":"article","title":"Absence of superconductivity in LK-99 at ambient conditions","authors":["Kapil Kumar","N. K. Karn","Yogesh Kumar","V. P. S. Awana"],"author_count":4,"year":2023,"published":"2023-08-07","venue":"ACS Omega","cited_by":35,"doi":"10.1021/acsomega.3c06096","arxiv_id":"2308.03544","nct_id":null,"source_url":"https://arxiv.org/abs/2308.03544","archive_url":"https://space-kitty.com/papers/arxiv:2308.03544","updated":"2023-08-09","pmid":null,"pmcid":null,"openalex_id":"W4387937518","pdf_url":"https://arxiv.org/pdf/2308.03544","abstract":"The report of synthesis of modified Lead apatite (LK-99) with evidence of superconductivity at more than boiling water temperature has steered the whole scientific community. There have been several failures to reproduce superconductivity in LK-99 including partial successes. Here, we have continued our efforts to synthesize phase pure LK-99 with improved precursors. The process has been followed as suggested by Sukbae Lee et. al., [1,2]. The phase purity of each precursor is evidenced by Powder X-ray diffraction (PXRD) and well fitted by Rietveld refinement. The PXRD confirms the synthesis of phase pure polycrystalline LK-99 with apatite structure. The freshly synthesized sample does not show any signature of superconductivity levitation on a magnet (diamagnetism). The magnetization measurements on SQUID also show that LK-99 is diamagnetic at 280 K, there is no sign of superconductivity in LK-99 at room temperature. Moreover, we have also performed first principle calculations to investigate the electronic band structure of the LK-99 near Fermi level. Our study verifies that the Cu doped lead apatite (LK-99) has bands crossing at Fermi level, indicating generation of strong correlation in the system.","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.mtrl-sci","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:2308.03110","kind":"article","title":"Ferromagnetic half levitation of LK-99-like synthetic samples","authors":["Kaizhen Guo","Yuan Li","Shuang Jia"],"author_count":3,"year":2023,"published":"2023-08-06","venue":"SCIENCE CHINA Physics, Mechanics & Astronomy , Volume 66, Issue 10: 107411 (2023)","cited_by":41,"doi":"10.1007/s11433-023-2201-9","arxiv_id":"2308.03110","nct_id":null,"source_url":"https://arxiv.org/abs/2308.03110","archive_url":"https://space-kitty.com/papers/arxiv:2308.03110","updated":"2023-08-15","pmid":null,"pmcid":null,"openalex_id":"W4385965300","pdf_url":"https://arxiv.org/pdf/2308.03110","abstract":"We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering method. Powder X-ray diffraction shows that the main contents are $\\mathrm{Pb_{10-x}Cu_x(PO_4)_6O}$ and $\\mathrm{Cu_2S}$, consistent with recent reports [arXiv:2307.12037; arXiv:2308.01192]. In some small flaky fragments, we successfully observed ``half levitation'' atop a $\\mathrm{Nd_2Fe_{14}B}$ magnet. Using magnetization measurements on such small pieces, as well as on a large piece which does not exhibit the half levitation, we show that the samples ubiquitously contain weak yet definitive soft ferromagnetic components. We argue that, together with the pronounced shape anisotropy of the small fragments, the soft ferromagnetism is sufficient to explain the observed half levitation in strong vertical magnetic fields. Our measurements do not indicate the presence of the Meissner effect, nor zero resistance, in our samples, leading us to believe that our samples do not exhibit superconductivity. The precise chemical composition and the physics behind the ferromagnetic component remain outstanding questions to be addressed in future research.","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:2308.00676","kind":"article","title":"Electronic structure of the putative room-temperature superconductor Pb$_9$Cu(PO$_4$)$_6$O","authors":["Liang Si","Karsten Held"],"author_count":2,"year":2023,"published":"2023-08-01","venue":"Physical Review B 108, L121110 (2023)","cited_by":43,"doi":"10.1103/physrevb.108.l121110","arxiv_id":"2308.00676","nct_id":null,"source_url":"https://arxiv.org/abs/2308.00676","archive_url":"https://space-kitty.com/papers/arxiv:2308.00676","updated":"2023-09-25","pmid":null,"pmcid":null,"openalex_id":"W4386887015","pdf_url":"https://arxiv.org/pdf/2308.00676","abstract":"A recent paper [Lee {\\em et al.}, J. Korean Cryt. Growth Cryst. Techn. {\\bf 33}, 61 (2023)] provides some experimental indications that Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O with $x\\approx 1$, coined LK-99, might be a room-temperature superconductor at ambient pressure. Our density-functional theory calculations show lattice parameters and a volume contraction with $x$ -- very similar to experiment. The DFT electronic structure shows Cu$^{2+}$ in a $3d^9$ configuration with two flat Cu bands crossing the Fermi energy. This puts Pb$_{9}$Cu(PO$_4$)$_6$O in an ultra-correlated regime and suggests that, without doping, it is a Mott or charge transfer insulator. If doped such an electronic structure might support flat-band superconductivity or an correlation-enhanced electron-phonon mechanism, whereas a diamagnet without superconductivity appears to be rather at odds with our results.","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.mtrl-sci","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:2304.08992","kind":"article","title":"Leading components and pressure-induced color changes in N-doped lutetium hydride","authors":["Xiangru Tao","Aiqin Yang","Shuxiang Yang","Yundi Quan","Peng Zhang"],"author_count":5,"year":2023,"published":"2023-06-12","venue":"中国科学通报：英文版","cited_by":29,"doi":"10.1016/j.scib.2023.06.007","arxiv_id":"2304.08992","nct_id":null,"source_url":"https://doi.org/10.1016/j.scib.2023.06.007","archive_url":"https://space-kitty.com/papers/arxiv:2304.08992","updated":"2023-06-13","pmid":"37349163","pmcid":null,"openalex_id":"W4380300764","pdf_url":"https://arxiv.org/pdf/2304.08992","abstract":"Recent experimental study by Dias {\\it et al.} claims to have discovered room-temperature superconductivity in lutetium-nitrogen-hydrogen system at 1 GPa [Nature 615, 244 (2023)], which sheds light on the long-held dream of ambient superconductivity. However, all follow-up experiments found no evidence of superconductivity. The compositions and the crystal structures of the lutetium-nitrogen-hydrogen system remain unknown. By employing the density functional theory based structure prediction algorithm, we suggest that in lutetium-nitrogen-hydrogen the major component is LuH$_2$ (Fm$\\bar{3}$m), together with minor LuN (Fm$\\bar{3}$m). The blue LuH$_2$ at ambient pressure will turn into purple and red color at higher pressures, possibly accompanied by the formation of vacancies at hydrogen-sites. In LuH$_2$ and LuN, the density of states at the Fermi level is dominated by the Lu-5d orbitals, while those from hydrogen and nitrogen are very small, leading to the absence of superconductivity in these two compounds. Nitrogen-doping to LuH$_2$ fails to enhance the superconductivity as well. In this work, we identify the leading components in N-doped lutetium hydride, explain its intriguing color changes under pressure, and elucidate why superconductivity is absent in the follow-up experiments.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"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:2105.08448","kind":"article","title":"Interorbital singlet pairing in Sr2RuO4 : A Hund's superconductor","authors":["S. Käser","Hugo U. R. Strand","Nils Wentzell","Antoine Georges","Olivier Parcollet","P. Hansmann"],"author_count":6,"year":2022,"published":"2022-04-01","venue":"Physical review. B./Physical review. B","cited_by":24,"doi":"10.1103/physrevb.105.155101","arxiv_id":"2105.08448","nct_id":null,"source_url":"https://doi.org/10.1103/physrevb.105.155101","archive_url":"https://space-kitty.com/papers/arxiv:2105.08448","updated":"2021-05-18","pmid":null,"pmcid":null,"openalex_id":"W4220915410","pdf_url":"http://link.aps.org/pdf/10.1103/PhysRevB.105.155101","abstract":"We study the superconducting gap function of Sr$_2$RuO$_4$. By solving the linearized Eliashberg equation with a correlated pairing vertex extracted from a dynamical mean-field calculation we identify the dominant pairing channels. An analysis of the candidate gap functions in orbital and quasiparticle band basis reveals that an inter-orbital singlet pairing of even parity is in agreement with experimental observations. It reconciles in particular the occurrence of a two-component order parameter with the presence of line-nodes of quasiparticles along the c-axis in the superconducting phase. The strong angular dependence of the gap along the Fermi surface is in stark contrast to its quasi-locality when expressed in the orbital basis. We identify local inter-orbital spin correlations as the driving force for the pairing and thus reveal the continuation of Hund's physics into the superconducting phase.","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":"arxiv:2304.07326","kind":"article","title":"Microscopic theory of colour in lutetium hydride","authors":["Sun-Woo Kim","Lewis J. Conway","Chris J. Pickard","Gheorghe Lucian Pascut","Bartomeu Monserrat"],"author_count":5,"year":2023,"published":"2023-04-14","venue":"Nature Communications 14, 7360 (2023)","cited_by":21,"doi":"10.17863/cam.102168","arxiv_id":"2304.07326","nct_id":null,"source_url":"http://arxiv.org/abs/2304.07326","archive_url":"https://space-kitty.com/papers/arxiv:2304.07326","updated":"2023-11-15","pmid":"37963870","pmcid":null,"openalex_id":"W4366341096","pdf_url":"https://arxiv.org/pdf/2304.07326","abstract":"Nitrogen-doped lutetium hydride has recently been proposed as a near-ambient-conditions superconductor. Interestingly, the sample transforms from blue to pink to red as a function of pressure, but only the pink phase is claimed to be superconducting. Subsequent experimental studies have failed to reproduce the superconductivity, but have observed pressure-driven colour changes including blue, pink, red, violet, and orange. However, discrepancies exist among these experiments regarding the sequence and pressure at which these colour changes occur. Given the claimed relationship between colour and superconductivity, understanding colour changes in nitrogen-doped lutetium hydride may hold the key to clarifying the possible superconductivity in this compound. Here, we present a full microscopic theory of colour in lutetium hydride, revealing that hydrogen-deficient LuH$_2$ is the only phase which exhibits colour changes under pressure consistent with experimental reports, with a sequence blue-violet-pink-red-orange. The concentration of hydrogen vacancies controls the precise sequence and pressure of colour changes, rationalising seemingly contradictory experiments. Nitrogen doping also modifies the colour of LuH$_2$ but it plays a secondary role compared to hydrogen vacancies. Therefore, we propose hydrogen-deficient LuH$_2$ as the key phase for exploring the superconductivity claim in the lutetium-hydrogen system. Finally, we find no phonon-mediated superconductivity near room temperature in the pink phase.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"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:2309.11541","kind":"article","title":"On the dynamical stability of copper-doped lead apatite","authors":["Sun-Woo Kim","Kang Wang","Siyu Chen","Lewis J. Conway","G. Lucian Pascut","Ion Errea","Chris J. Pickard","Bartomeu Monserrat"],"author_count":8,"year":2023,"published":"2023-09-20","venue":"npj Computational Materials 10, 16 (2024)","cited_by":15,"doi":"10.1038/s41524-024-01206-9","arxiv_id":"2309.11541","nct_id":null,"source_url":"https://arxiv.org/abs/2309.11541","archive_url":"https://space-kitty.com/papers/arxiv:2309.11541","updated":"2024-01-22","pmid":null,"pmcid":null,"openalex_id":"W4391042284","pdf_url":"https://arxiv.org/pdf/2309.11541","abstract":"The recent claim of room temperature superconductivity in a copper-doped lead apatite compound, called LK-99, has sparked remarkable interest and controversy. Subsequent experiments have largely failed to reproduce the claimed superconductivity, while theoretical works have identified multiple key features including strong electronic correlation, structural instabilities, and dopability constraints. A puzzling claim of several recent theoretical studies is that both parent and copper-doped lead apatite structures are dynamically unstable at the harmonic level, questioning decades of experimental reports of the parent compound structures and the recently proposed copper-doped structures. In this work, we demonstrate that both parent and copper-doped lead apatite structures are dynamically stable at room temperature. Anharmonic phonon-phonon interactions play a key role in stabilizing some copper-doped phases, while most phases are largely stable even at the harmonic level. We also show that dynamical stability depends on both volume and correlation strength, suggesting controllable ways of exploring the copper-doped lead apatite structural phase diagram. Our results fully reconcile the theoretical description of the structures of both parent and copper-doped lead apatite with experiment.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","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":"doi:10.1038/d41586-024-00716-2","kind":"article","title":"Superconductivity scandal: the inside story of deception in a rising star’s physics lab","authors":["Dan Garisto"],"author_count":1,"year":2024,"published":"2024-03-08","venue":"Nature","cited_by":18,"doi":"10.1038/d41586-024-00716-2","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1038/d41586-024-00716-2","archive_url":"https://space-kitty.com/papers/doi:10.1038/d41586-024-00716-2","updated":null,"pmid":"38459343","pmcid":null,"openalex_id":"W4392601351","pdf_url":null,"abstract":null,"abstract_license":null,"license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["Academic integrity and plagiarism"],"details":null,"provenance":"openalex","attribution":"Metadata and citation counts: OpenAlex (CC0)."},{"id":"doi:10.1063/5.0166430","kind":"article","title":"The near-room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition","authors":["Di Peng","Qiaoshi Zeng","Fujun Lan","Zhenfang Xing","Yang Ding","Ho‐kwang Mao"],"author_count":6,"year":2023,"published":"2023-07-28","venue":"Matter and Radiation at Extremes","cited_by":20,"doi":"10.1063/5.0166430","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1063/5.0166430","archive_url":"https://space-kitty.com/papers/doi:10.1063/5.0166430","updated":null,"pmid":null,"pmcid":null,"openalex_id":"W4385341252","pdf_url":"https://pubs.aip.org/aip/mre/article-pdf/doi/10.1063/5.0166430/18065204/058401_1_5.0166430.pdf","abstract":"The recent report of superconductivity in nitrogen-doped lutetium hydride (Lu-H-N) at 294 K and 1 GPa brought hope for long-sought-after ambient-condition superconductors. However, the failure of scientists worldwide to independently reproduce these results has cast intense skepticism on this exciting claim. In this work, using a reliable experimental protocol, we synthesized Lu-H-N while minimizing extrinsic influences and reproduced the sudden change in resistance near room temperature. With quantitative comparison of the temperature-dependent resistance between Lu-H-N and the pure lutetium before reaction, we were able to clarify that the drastic resistance change is most likely caused by a metal-to-poor-conductor transition rather than by superconductivity. Herein, we also briefly discuss other issues recently raised in relation to the Lu-H-N system.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["High-pressure geophysics and materials"],"details":null,"provenance":"openalex","attribution":"Abstract of \"The near-room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition\" by Di Peng, Qiaoshi Zeng, Fujun Lan et al., https://doi.org/10.1063/5.0166430, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified."},{"id":"arxiv:0710.0876","kind":"article","title":"Spin Meissner Effect in Superconductors and the Origin of the Meissner Effect","authors":["J. E. Hirsch"],"author_count":1,"year":2007,"published":"2007-10-04","venue":"Europhys. Lett. 81, 67003 (2008)","cited_by":64,"doi":"10.1209/0295-5075/81/67003","arxiv_id":"0710.0876","nct_id":null,"source_url":"https://arxiv.org/abs/0710.0876","archive_url":"https://space-kitty.com/papers/arxiv:0710.0876","updated":"2007-11-21","pmid":null,"pmcid":null,"openalex_id":"W2094267075","pdf_url":"https://arxiv.org/pdf/0710.0876","abstract":"We propose a dynamical explanation of the Meissner effect in superconductors and predict the existence of a spin Meissner effect: that a macroscopic spin current flows within a London penetration depth $λ_L$ of the surface of superconductors in the absence of applied external fields, with carrier density = the superfluid density and carrier speed $v=\\hbar/(4m_eλ_L$) ($m_e=$bare electron mass). The two members of a Cooper pair circulate in orbits of radius $2λ_L$ in opposite direction and the spin current in a Cooper pair has orbital angular momentum $\\hbar$. Our description also provides a 'geometric' interpretation of the difference between type I and type II superconductors.","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:2308.01135","kind":"article","title":"Electronic Structure and Vibrational Stability of Copper-substituted Lead Apatite (LK-99)","authors":["J. Cabezas-Escares","N. F. Barrera","R. H. Lavroff","A. N. Alexandrova","C. Cardenas","F. Munoz"],"author_count":6,"year":2023,"published":"2023-08-02","venue":"Phys. Rev. B 109, 144515, 2024","cited_by":17,"doi":"10.1103/physrevb.109.144515","arxiv_id":"2308.01135","nct_id":null,"source_url":"https://arxiv.org/abs/2308.01135","archive_url":"https://space-kitty.com/papers/arxiv:2308.01135","updated":"2024-03-27","pmid":null,"pmcid":null,"openalex_id":"W4394767149","pdf_url":"https://arxiv.org/pdf/2308.01135","abstract":"Two recent preprints in the physics archive (arXiv) have called attention as they claim experimental evidence that a Cu-substituted apatite material (dubbed LK-99) exhibits superconductivity at room temperature and pressure. If this proves to be true, LK-99 will be a ``holy grail\" of superconductors. In this work, we used Density Functional Theory (DFT+U) calculations to elucidate some key features of the electronic structure of LK-99. We find two different phases of this material: (i) a hexagonal lattice featuring metallic half-filled and spin-split bands, a nesting of the Fermi surface, a remarkably large electron-phonon coupling, but this lattice is vibrationally unstable. (ii) a triclinic lattice, with the Cu and surrounding O distorted. This lattice is vibrationally stable and its bands correspond to an insulator. In a crystal, the Cu atoms should oscillate between equivalent triclinic positions, with an average close to the hexagonal positions. We discuss the electronic structure expected from these fluctuations and if it is compatible with superconductivity.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con","cond-mat.mtrl-sci"],"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:2308.11768","kind":"article","title":"Ferromagnetic and insulating behavior in both half magnetic levitation and non-levitation LK-99 like samples","authors":["Pinyuan Wang","Xiaoqi Liu","Jun Ge","Chengcheng Ji","Haoran Ji","Yanzhao Liu","Yiwen Ai","Gaoxing Ma","Shichao Qi","Jian Wang"],"author_count":10,"year":2023,"published":"2023-08-17","venue":"Quantum Front 2, 10 (2023)","cited_by":17,"doi":"10.1007/s44214-023-00035-z","arxiv_id":"2308.11768","nct_id":null,"source_url":"https://arxiv.org/abs/2308.11768","archive_url":"https://space-kitty.com/papers/arxiv:2308.11768","updated":"2023-08-28","pmid":null,"pmcid":null,"openalex_id":"W4386294387","pdf_url":"https://arxiv.org/pdf/2308.11768","abstract":"Finding materials exhibiting superconductivity at room temperature has long been one of the ultimate goals in physics and material science. Recently, room-temperature superconducting properties have been claimed in a copper substituted lead phosphate apatite (Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O, or called LK-99) [1-3]. Using a similar approach, we have prepared LK-99 like samples and confirmed the half-levitation behaviors in some small specimens under the influence of a magnet at room temperature. To examine the magnetic properties of our samples, we have performed systematic magnetization measurements on the as-grown LK-99-like samples, including the half-levitated and non-levitated samples. The magnetization measurements show the coexistence of soft-ferromagnetic and diamagnetic signals in both half-levitated and non-levitated samples. The electrical transport measurements on the as-grown LK-99-like samples including both half-levitated and non-levitated samples show an insulating behavior characterized by the increasing resistivity with the decreasing temperature.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["cond-mat.supr-con","cond-mat.mtrl-sci","cond-mat.str-el"],"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:cond-mat/9808249","kind":"article","title":"Is the nonlinear Meissner effect unobservable?","authors":["M. -R. Li","P. J. Hirschfeld","P. Woelfle"],"author_count":3,"year":1998,"published":"1998-08-23","venue":"Phys. Rev. Lett. 81, 5640 (1998)","cited_by":49,"doi":"10.1103/physrevlett.81.5640","arxiv_id":"cond-mat/9808249","nct_id":null,"source_url":"https://arxiv.org/abs/cond-mat/9808249","archive_url":"https://space-kitty.com/papers/arxiv:cond-mat/9808249","updated":"1998-12-09","pmid":null,"pmcid":null,"openalex_id":"W2013973750","pdf_url":"https://arxiv.org/pdf/cond-mat/9808249","abstract":"We examine the effects of nonlocal electrodynamics for a d-wave superconductor on the field dependence of the magnetic penetration depth. The linear field dependence predicted in the local limit, commonly known as the nonlinear Meissner effect, is instead found to be quadratic, $δλ\\sim H^2$ for fields below a crossover scale $H^*$. This crossover is shown to be geometry dependent and for most orientations of the screening currents is of the same order as or greater than $H_{c1}$, implying that the nonlinear Meissner effect can not be observed. For special orientations where the current flows along the nodal directions, however, the nonlinear Meissner effect may be recovered.","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:2308.01516","kind":"preprint","title":"Successful growth and room temperature ambient-pressure magnetic levitation of LK-99","authors":["Hao Wu","Li Yang","Bichen Xiao","Haixin Chang"],"author_count":4,"year":2023,"published":"2023-08-03","venue":null,"cited_by":16,"doi":null,"arxiv_id":"2308.01516","nct_id":null,"source_url":"https://arxiv.org/abs/2308.01516","archive_url":"https://space-kitty.com/papers/arxiv:2308.01516","updated":"2023-08-03","pmid":null,"pmcid":null,"openalex_id":"W4385967651","pdf_url":"https://arxiv.org/pdf/2308.01516","abstract":"Recently, Sukbae Lee et al. reported inspiring experimental findings on the atmospheric superconductivity of a modified lead apatite crystal (LK-99) at room temperature (10.6111/JKCGCT.2023.33.2.061, arXiv: 2307.12008, arXiv: 2307.12037). They claimed that the synthesized LK-99 materials exhibit the Meissner levitation phenomenon of superconductors and have a superconducting transition temperature (Tc) higher than 400 K. Here, for the first time, we successfully verify and synthesize the LK-99 crystals which can be magnetically levitated with larger levitated angle than Sukbae Lee's sample at room temperature. It is expected to realize the true potential of room temperature, non-contact superconducting magnetic levitation in near future.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":"cc-by-nc-nd","is_open_access":true,"retracted":false,"peer_reviewed":false,"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:2010.10307","kind":"preprint","title":"Absence of high temperature superconductivity in hydrides under pressure","authors":["J. E. Hirsch","F. Marsiglio"],"author_count":2,"year":2020,"published":"2020-10-20","venue":"Nature 596, E9-E10 (2021)","cited_by":19,"doi":"10.1038/s41586-021-03595-z","arxiv_id":"2010.10307","nct_id":null,"source_url":"http://arxiv.org/abs/2010.10307","archive_url":"https://space-kitty.com/papers/arxiv:2010.10307","updated":"2020-10-20","pmid":null,"pmcid":null,"openalex_id":"W3094366578","pdf_url":"https://arxiv.org/pdf/2010.10307","abstract":"The long-sought goal of room-temperature superconductivity has reportedly recently been realized in a carbonaceous sulfur hydride compound under high pressure, as reported by Snider et al. [1]. The evidence presented in that paper is stronger than in other similar recent reports of high temperature superconductivity in hydrides under high pressure [2-7], and has been received with universal acclaim [8-10]. Here we point out that features of the experimental data shown in Ref. [1] indicate that the phenomenon observed in that material is not superconductivity. This observation calls into question earlier similar claims of high temperature conventional superconductivity in hydrides under high pressure based on similar or weaker evidence [2-7].","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":true,"retracted":false,"peer_reviewed":false,"categories":["High-pressure geophysics and materials"],"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:2308.05001","kind":"preprint","title":"Observation of abnormal resistance-temperature behavior along with diamagnetic transition in Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O-based composite","authors":["Hao Wu","Li Yang","Jie Yu","Gaojie Zhang","Bichen Xiao","Haixin Chang"],"author_count":6,"year":2023,"published":"2023-08-09","venue":null,"cited_by":10,"doi":null,"arxiv_id":"2308.05001","nct_id":null,"source_url":"https://arxiv.org/abs/2308.05001","archive_url":"https://space-kitty.com/papers/arxiv:2308.05001","updated":"2023-08-09","pmid":null,"pmcid":null,"openalex_id":"W4385750293","pdf_url":"https://arxiv.org/pdf/2308.05001","abstract":"Recently, Sukbae Lee et al.reported that material Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O (LK-99) has a series of characteristics of room temperature superconductors, including diamagnetic transition, resistance jump, nearly zero-resistance, magnetic field-dependent IV characteristics and so on (10.6111/JKCGCT.2023.33.2.061, arXiv:2307.12008, arXiv:2307.12037). However, whether LK-99 is really a room temperature superconductor is still controversial. On the one hand, some people think that the relatively weak diamagnetism of LK-99 reported by Sukbae Lee et al. is not the Meissner effect. On the other hand, there are doubts about the authenticity of its zero-resistance test results. Global replication studies have shown that LK-99 does have a large diamagnetic (arXiv:2308.01516), and also found a zero-resistance behavior at a low temperature of 110 $^\\circ$K (arXiv:2308.01192). However, up to now, there is still no direct reproducible evidence to support Sukbae Lee et al.'s conclusion that LK-99 is a room temperature superconductor. Here, a distinct resistance jump was observed at about 387 $^\\circ$K under ambient pressure in our experiment for unclear reason including possible impurity's contribution. The overall resistance of the test LK-99 sample still shows semiconductivity, and the resistance cannot really drop to zero. Our findings indicate that to identify the true potential of LK-99, high quality crystals without impurity are very important.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":false,"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:nucl-th/0301090","kind":"article","title":"Electromagnetic Meissner effect in spin-one color superconductors","authors":["Andreas Schmitt","Qun Wang","Dirk H. Rischke"],"author_count":3,"year":2003,"published":"2003-01-28","venue":"Phys.Rev.Lett. 91 (2003) 242301","cited_by":69,"doi":"10.1103/physrevlett.91.242301","arxiv_id":"nucl-th/0301090","nct_id":null,"source_url":"https://arxiv.org/abs/nucl-th/0301090","archive_url":"https://space-kitty.com/papers/arxiv:nucl-th/0301090","updated":"2003-12-18","pmid":null,"pmcid":null,"openalex_id":"W2075762993","pdf_url":"https://arxiv.org/pdf/nucl-th/0301090","abstract":"It is shown that color-superconducting quark matter, where quarks of the same flavor form Cooper pairs with spin one, exhibits an electromagnetic Meissner effect. This is in contrast to spin-zero color superconductors where Cooper pairs consist of quarks with different flavors.","abstract_license":"CC0-1.0 (arXiv descriptive metadata)","license":null,"is_open_access":false,"retracted":false,"peer_reviewed":null,"categories":["nucl-th","astro-ph","cond-mat.supr-con","hep-ph"],"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:2308.04301","kind":"article","title":"Electronic correlations in promising room-temperature superconductor Pb$_9$Cu(PO$_4$)$_6$O: a DFT+DMFT study","authors":["Dmitry M. Korotin","Dmitry Y. Novoselov","Alexey O. Shorikov","Vladimir I. Anisimov","Artem R. Oganov"],"author_count":5,"year":2023,"published":"2023-08-08","venue":"Physical review. B./Physical review. B","cited_by":18,"doi":"10.1103/physrevb.108.l241111","arxiv_id":"2308.04301","nct_id":null,"source_url":"https://arxiv.org/abs/2308.04301","archive_url":"https://space-kitty.com/papers/arxiv:2308.04301","updated":"2023-08-08","pmid":null,"pmcid":null,"openalex_id":"W4389783103","pdf_url":"https://arxiv.org/pdf/2308.04301","abstract":"We present results of the first investigations on the correlated nature of electronic states that cross the Fermi level in Pb$_9$Cu(PO$_4$)$_6$O aka LK-99 obtained within the DFT + DMFT approach. Coulomb correlations between Cu-$d$ electrons led to the opening of the band gap between the extra-O $p$ and Cu $d_{xz}/d_{yz}$ states. We state that oxygen $p$ states play a significant role in the electronic properties of LK-99. We also assume that doping with electrons is necessary to turn the stoichiometric Pb$_9$Cu(PO$_4$)$_6$O into conducting state.","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."}],"next":"https://space-kitty.com/api/v1/topics/room-temperature-claims/papers?sort=top&limit=25&offset=25"}