Back to Search Start Over

Ternary superconducting hydrides stabilized via Th and Ce elements at mild pressures

Authors :
Qiwen Jiang
Zihan Zhang
Hao Song
Yanbin Ma
Yuanhui Sun
Maosheng Miao
Tian Cui
Defang Duan
Source :
Fundamental Research, Vol 4, Iss 3, Pp 550-556 (2024)
Publication Year :
2024
Publisher :
KeAi Communications Co. Ltd., 2024.

Abstract

The discovery of covalent H3S and clathrate structure LaH10 with excellent superconducting critical temperatures at high pressures has facilitated a multitude of research on compressed hydrides. However, their superconducting pressures are too high (generally above 150 GPa), thereby hindering their application. In addition, making room-temperature superconductivity close to ambient pressure in hydrogen-based superconductors is challenging. In this work, we calculated the chemically “pre-compressed” Be-H by heavy metals Th and Ce to stabilize the superconducting phase near ambient pressure. An unprecedented ThBeH8 (CeBeH8) with a “fluorite-type” structure was predicted to be thermodynamically stable above 69 GPa (76 GPa), yielding a Tc of 113 K (28 K) decompressed to 7 GPa (13 GPa) by solving the anisotropic Migdal–Eliashberg equations. Be-H vibrations play a vital role in electron–phonon coupling and structural stability of these ternary hydrides. Our results will guide further experiments toward synthesizing ternary hydride superconductors at mild pressures.

Details

Language :
English
ISSN :
26673258 and 73509213
Volume :
4
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Fundamental Research
Publication Type :
Academic Journal
Accession number :
edsdoj.04ed3e6150064acd93dffa2e73509213
Document Type :
article
Full Text :
https://doi.org/10.1016/j.fmre.2022.11.010