Abstract
Achieving superconductivity in hydrides at lower pressures is a long-standing scientific challenge. Here, we propose that reducing their effective dimensionality might be a possible route to achieve this goal. First-principles structural search calculations identify several two-dimensional transition metal hydrides (TMHs) with phonon-mediated superconductivity. Among them, the two phases with and symmetries are predicted to have the highest values up to 44.4 and 47.8 K, comparable to the well-known superconductor. Their superconductivity mainly originates from the coupling of Cu and electrons with in-plane H-vibrational phonons. Interestingly, both structures show a unique superconducting energy gap by solving the anisotropic Eliashberg equations. Furthermore, the superconductivity of TMHs is closely related to the polarity of the TM-H bond. Our paper paves the way for finding hydride superconductors in low-dimensional materials.
- Received 10 May 2022
- Accepted 6 July 2022
DOI:https://doi.org/10.1103/PhysRevB.106.014514
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