Superconductivity in CeBeH8and CeBH8at moderate pressures

Yu Hou; Bin Li; Yan Bai; Xiaofeng Hao; Yeqian Yang; Fengfeng Chi; Shengli Liu; Jie Cheng; Zhixiang Shi

doi:10.1088/1361-648X/ac9bbc

Superconductivity in CeBeH₈and CeBH₈at moderate pressures

J Phys Condens Matter. 2022 Oct 28;34(50). doi: 10.1088/1361-648X/ac9bbc.

Authors

Yu Hou¹, Bin Li², Yan Bai¹, Xiaofeng Hao¹, Yeqian Yang¹, Fengfeng Chi², Shengli Liu², Jie Cheng², Zhixiang Shi³

Affiliations

¹ College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, People's Republic of China.
² New Energy Technology Engineering Laboratory of Jiangsu Province and School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, People's Republic of China.
³ School of Physics, Southeast University, Nanjing 211189, People's Republic of China.

PMID: 36261041
DOI: 10.1088/1361-648X/ac9bbc

Abstract

High-pressure structural searches of superhydrides CeBeH₈and CeBH₈were performed under ambient pressure up to 300 GPa. We identifyFm3‾m-CeBeH₈with a superconducting transition temperatureT_cof 56 K at 10 GPa. Two more phases with spacegroupR3‾mandC2/m, were investigated within the increasing pressures. CeBH₈shows a similar phase transition process as CeBeH₈but with higher transition pressures and higherT_c.Fm3‾m-CeBH₈is predicted to be superconducting above 120 GPa with a maximumT_cof 118 K at 150 GPa.R3‾m-CeBH₈andC2/m-CeBH₈are dynamically stable above 120 GPa and 100 GPa, respectively. The maximumT_cis 123 K at 195 GPa forR3‾m-CeBH₈, and 115 K at 350 GPa forC2/m-CeBH₈. Our work enriches the family of ternary hydrides and may provide a useful guideline for further search for superconducting hydrides at low and moderate pressures.

Keywords: high pressures; hydrides; superconductivity.