Al-Based Few-Hydrogen Metal-Bonded Perovskite High-Tc Superconductor Al4H up to 54 K under Atmospheric Pressure
Abstract
Multi-hydrogen lanthanum hydrides have shown the highest critical temperature Tc at 250-260 K under 170-200 GPa. However, such high pressure is a great challenge for sample preparation and practical application. To address this challenge, we propose a novel design strategy for ambient-pressure high-Tc superconductors by constructing new few-hydrogen metal-bonded perovskite hydrides, such as Al-based superconductor Al4H, with better ductility than the well-known multi-hydrogen, cuprate and Fe-based superconductors. Based on the Migdal-Eliashberg theory, we predict that the structurally stable Al4H has a favorable high Tc up to 54 K under atmospheric pressure, similar to SmOFeAs.
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