Phonon-mediated superconductivity in the metal-bonded perovskite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Al</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mi mathvariant="normal">H</mml:mi></mml:math> up to 54 K under ambient pressure
Yong He, Jing Lü, Xinqiang Wang, Junjie Shi
Abstract
Multihydrogen lanthanum hydrides have shown the highest critical temperature ${T}_{c}$ at 250--260 K under pressures of 170--200 GPa. However, such high pressure is a great challenge for sample preparation and practical applications. To address this challenge, we propose a design strategy for ambient-pressure superconductors that involves constructing few-hydrogen metal-bonded perovskite hydrides, such as the Al-based superconductor ${\mathrm{Al}}_{4}\mathrm{H}$, with better ductility than the well-known multihydrogen, cuprate, and Fe-based superconductors. Based on the Migdal-Eliashberg theory, we predict that the structurally stable ${\mathrm{Al}}_{4}\mathrm{H}$ has a favorable ${T}_{c}$ of up to 54 K under ambient pressure.