Ambient-Pressure Anisotropic Single-Gap Superconductivity in La-Trapped B_(26)Cages with Superior Hardness

作     者：Haoqi Chen Yushan Tang Haowen Jiang Xuehui Jiang Jialin Wang Chengyao Zhang Defang Duan Yanbin Ma Jing Dong 陈浩琦;唐玉山;姜皓文;姜雪辉;王佳琳;张铖瑶;段德芳;马艳斌;董晶

作者机构：School of ScienceHarbin University of Science and TechnologyHarbin 150080China School of ScienceHarbin Institute of Technology(Shenzhen)Shenzhen 518055China College of PhysicsJilin UniversityChangchun 130012China School of Public HealthMudanjiang Medical UniversityMudanjiang 157011China 

出 版 物：《Chinese Physics Letters》 (中国物理快报(英文版))

年 卷 期：2025年第42卷第1期

页      面：177-191页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11904067,12122405,52072188,12274169 51632002) 

主　　题：6) anisotropic breakthrough 

摘      要：Recently,a breakthrough in the high-pressure synthesis of sp^(3)-bonded clathrate-like R-3m-L_(a)B_(8)featuring Latrapped B_(26)cages was *** the superconducting critical temperature(T_(c))and Vickers hardness(H_(v))of L_(a)B_(8)were estimated,the anisotropic superconductivity and superconducting gap nature remain *** stability of pure B_(26)cages under ambient conditions is of interest for exploring the B_(26)hardness and the role of La atoms in the L_(a)B_(8)*** resolving the Allen–Dynes modified Mc Millan equation and the anisotropic Eliashberg equations,it was found that L_(a)B_(8)exhibits anisotropic single-gap superconductivity with T_(c)=19.0~26.5 K,and the superconducting gap anisotropic ratio reaches 48.50%at 5 *** significantly,our work fundamentally validated the coupling of B-2p orbitals with the optical double-degenerate E_(g)phonon modes and A_(g)phonon mode from a novel *** H_(v)of B_(26)cages was determined to be 18.6 GPa,which is lower than that of La-trapped B_(26)cages(i.e.,L_(a)B_(8)),indicating that La acts as a hardness enhancer for L_(a)B_(8).