High-temperature superconductivity of ternary Cs-In-H compounds at low pressure
Hongyu Huang, Min Wang, Xiaoyan Yan, Hao Song, Defang Duan, Tian Cui, Mingyang Du
DOI 10.1103/PhysRevB.111.224502 · Physical Review B
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Abstract
Hydride superconductors are considered promising candidates for achieving high-temperature superconductivity, yet the ultrahigh pressures required for their stabilization present significant challenges for practical applications. In this study, a series of Cs-In-H ternary hydrides were systematically investigated at 50 GPa using crystal-structure prediction methods. Four thermodynamically stable phases and one metastable high-symmetry structure, Cs3InH7, were identified. Notably, Cs3InH7 exhibits a superconducting transition temperature of 81 K at 41 GPa. In the Pm−3m−Cs3InH7 structure, the quasi-H2 molecular units form the alloy framework, serving as the primary contributors to its superconducting properties, while the body-centered single H atom plays a pivotal role in regulating the overall performance. This high-temperature superconductivity can be attributed to the Fermi-surface grid contributed by In-H near the Fermi level, as well as the phonon softening induced by the nesting effect. This work offers a promising direction for the development of low-pressure hydride superconductors and lays a solid foundation for future experimental investigations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cs3InH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.3 | 30 GPa | unknown |
| Cs3InH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.2 | 50 GPa | unknown |
| Cs3InH7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81.1 | 41 GPa | unknown |
| Cs3InH7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48.1 | 50 GPa | unknown |
| Cs3In2H2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | 50 GPa | unknown |
| Cs3InH5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | 50 GPa | unknown |
| Cs2In2H Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | 50 GPa | unknown |
| Cs2In2H5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | 50 GPa | unknown |
| CaYH12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 230 | 180 GPa | unknown |
| (La,Y)H6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 237 | 183 GPa | unknown |
| (La,Y)H10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 245 | 183 GPa | unknown |
| LaBeH8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | 80 GPa | unknown |
| LaTh3H24 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 198 | 50 GPa | unknown |
| NaKH12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 245 | 60 GPa | unknown |
| ScH12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 304 | 100 GPa | unknown |
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