Related papers: High-Tc superconductivity above 130 K in cubic MH4 compounds at ambient pressure

High-Tc superconductivity above 130 K in cubic MH4 compounds at ambient pressure

URL: http://arxiv.org/abs/2511.04222v1
Date: Thu, 06 Nov 2025 09:44:31 GMT
Title: High-Tc superconductivity above 130 K in cubic MH4 compounds at ambient pressure
Authors: Xinxin Li, Weishuo Xu, Zengguang Zhou, Jingming Shi, Hanyu Liu, Yue-Wen Fang, Wenwen Cui, Yinwei Li, Miguel A. L. Marques,
Abstract summary: Hydrides have long been considered promising candidates for achieving room-temperature superconductivity.<n>Here, we propose a class of high-Tc ambient-pressure superconductors with MH4 stoichiometry.
Score: 2.380807102637853
License: http://creativecommons.org/licenses/by-nc-sa/4.0/
Abstract: Hydrides have long been considered promising candidates for achieving room-temperature superconductivity; however, the extremely high pressures typically required for high critical temperatures remain a major challenge in experiment. Here, we propose a class of high-Tc ambient-pressure superconductors with MH4 stoichiometry. These hydrogen-based compounds adopt the bcc PtHg4 structure type, in which hydrogen atoms occupy the one-quarter body-diagonal sites of metal lattices, with the metal atoms acting as chemical templates for hydrogen assembly. Through comprehensive first-principles calculations, we identify three promising superconductors, PtH4, AuH4 and PdH4, with superconducting critical temperatures of 84 K, 89 K, and 133 K, respectively, all surpassing the liquid-nitrogen temperature threshold of 77 K. The remarkable superconducting properties originate from strong electron-phonon coupling associated with hydrogen vibrations, which in turn arise from phonon softening in the mid-frequency range. Our results provide crucial insights into the design of high-Tc superconductors suitable for future experiments and applications at ambient pressure.

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