# Superconducting Hydrides Under Pressure: State of the Field (October 2026)

Research dossier · v1 · updated 2026-10-30 · 3,770 words · 34 sources · 29 claims · verification: verified

Covers hydrogen-rich superconductors stabilized at megabar pressures, including H3S, LaH10, yttrium, calcium and ternary superhydrides, the diamond-anvil measurement methods they depend on, and the reproducibility failures behind the retraction of two earlier room-temperature-era reports, in 2022 and 2023. The main takeaway: the best-established experimental critical temperatures cluster near 200 to 250 K, while the 2025 near-room-temperature La-Sc-H preprint remains unconfirmed and ambient-pressure hydride superconductivity remains calculated in the literature checked.

## Contents

- Executive summary
- Background and core concepts
- Timeline of key milestones
- State of the art
  - Sulfur and lanthanum hydrides
  - Yttrium, calcium, cerium and related superhydrides
  - Ternary systems and the 2025 La-Sc-H claim
  - Lower-pressure routes and new chemistries
  - Quantitative benchmarks
- Open problems and active debates
  - Reproducibility of room-temperature claims
  - Measurement limits at megabar pressure
  - Theory versus experiment
  - Coulomb pseudopotential and anharmonic corrections
  - Lutetium hydrides
  - The La-Sc-H claim
  - Ambient-pressure route
- Major programs and players
- Outlook: what to watch (next 12-18 months)
- Key papers
- Glossary

## Sample findings

- The sulfur hydride H3S reached a critical temperature of 203 K at about 155 GPa, the first high-Tc benchmark of the modern hydride program.
- LaH10 reached a critical temperature of about 250 K, the binary benchmark used in this dossier.

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