Theoretical Predictions on Superconducting Phase above Room Temperature in Lutetium-Beryllium Hydrides at High Pressures  

作　　者：李斌 杨业迁 范雨香 朱聪 刘胜利 施智祥 Bin Li;Yeqian Yang;Yuxiang Fan;Cong Zhu;Shengli Liu;Zhixiang Shi(School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;School of Physics,Southeast University,Nanjing 211189,China)

机构地区：[1]School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [3]School of Physics,Southeast University,Nanjing 211189,China

出　　处：《Chinese Physics Letters》2023年第9期82-86,共5页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2018YFA0704300);the National Natural Science Foundation of China(Grant No.U1932217);the StartUp Fund of Nanjing University of Posts and Telecommunications(Grant Nos.NY219087 and NY220038)。

摘　　要：High-pressure structural search was performed on the hydrogen-rich compound LuBeH8at pressures up to 200 GPa.We found an Fm3m structure that exhibits stability and superconductivity above 100 GPa.Our phonon dispersion,electronic band structure,and superconductivity analyses in the 100–200 GPa pressure range reveal a strong electron–phonon coupling in Lu Be H8,while the superconducting critical temperature Tcshows a decreasing trend as the pressure increases,with T_(c)=255 K at 200 GPa and maximal T_(c)=355 K at 100 GPa.This study demonstrated the room-temperature superconductivity in Fm3m thus enriching the family of ternary hydrides.These findings provide valuable guidance for identifying new high-temperature superconducting hydrides.

关 键 词：SUPERCONDUCTIVITY structure PHASE 

分 类 号：O511.3[一般工业技术—材料科学与工程]