Multi-hydrogen lanthanum hydrides have shown the highest critical temperature
Tcβ 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 high-Tcβ superconductors by
constructing new few-hydrogen metal-bonded perovskite hydrides at ambient
pressure, such as Al4βH, with better ductility than the well-known
multi-hydrogen, cuprate and iron-based superconductors. Based on the
Migdal-Eliashberg theory, we predict that the structurally stable Al4βH
has a favorable high Tcβ up to 54 K under atmospheric pressure, similar to
SmOFeAs.Comment: 6 pages, 4 figure