Theoretical prediction of high-temperature superconductivity in SrAuH3 at ambient pressure

Abstract

We present a comprehensive computational investigation of electron-phonon interactions in MXH3 hydride compounds, where M represents alkali and post-transition metals, and X denotes 3d, 4d, and 5d transition metals. Our density functional theory calculations identify 17 dynamically stable compounds. Notably, SrAuH3 and SrZnH3 emerge as theoretical ambient-pressure superconductors with predicted critical temperatures (Tc) exceeding 100 K. Analysis of the electronic structure reveals that the X component dominates the density of states at the Fermi level, playing a crucial role in determining electron-phonon coupling strength and superconducting properties. We elucidate the underlying mechanisms governing these properties through detailed examination of the electronic and vibrational spectra. Our findings may challenge the prevailing notion that high-Tc superconductivity in hydrides requires extreme pressures, potentially paving the way for practical applications. This study also provides valuable insights to guide future experimental efforts in the synthesis of ambient-pressure hydride superconductors.

Source-reported materials — not catalogue approval

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