Hydrogen Vacancy Induced Superconductivity Collapse in A15 Lanthanum Hydride
Israel Osmond, Lewis J. Conway, Mikhail A. Kuzovnikov, Callum Stevens, Tomas Marqueño, Hannah A. Shuttleworth, Andrew Huxley, Chris J. Pickard, Graeme J. Ackland, Ross T. Howie, Miriam Peña-Alvarez
DOI 10.1103/8b43-4dvw · Physical Review Letters
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Abstract
Hydrogen-rich lanthanum compounds show the highest known superconducting transition temperatures at high pressure. Despite the pivotal role of hydrogen within these systems, there has been no systematic exploration of how the composition and superconducting properties are intertwined. Our experimental and computational studies demonstrate that A15-type LaH5.75−x hosts high-Tc superconductivity (Tc=98 K at 94 GPa) when available interstitial sites are fully occupied with hydrogen. Upon decompression, a site-selective hydrogen depopulation drives a superconductor-to-insulator transition with a threshold composition of LaH5. Strikingly, the A15 framework is experimentally retained from 120 to 4 GPa, with reversible pressure-dependent hydrogen content changes from LaH5.75 down to LaH3.25. Our results demonstrate the exceptional stability and tunability of the A15 framework, offering a unique platform to probe the interplay between composition, structure, and superconductivity in hydrogen-rich materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaH5.75-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | 94 GPa | onset |
| LaH5.75-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | 98 GPa | onset |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | 170 GPa | unknown |
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