La_(4)TX(T=Ru,Rh,Ir;X=Al,In):一个具有可调节反对称自旋轨道耦合强度的新型非中心对称超导体系

作     者：苏杭 杜锋 罗帅帅 聂智勇 李蕊 谢武 沈斌 王云枫 王安 Toshiro Takabatake 曹超 Michael Smidman 袁辉球 Hang Su;Feng Du;Shuaishuai Luo;Zhiyong Nie;Rui Li;Wu Xie;Bin Shen;Yunfeng Wang;An Wang;Toshiro Takabatake;Chao Cao;Michael Smidman;Huiqiu Yuan

作者机构：Center for Correlated Matter and School of PhysicsZhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and DeviceSchool of PhysicsZhejiang UniversityHangzhou 310058China Department of Quantum MatterGraduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 739-8530Japan Condensed Matter GroupDepartment of PhysicsHangzhou Normal UniversityHangzhou 311121China State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2023年第66卷第3期

页      面：1114-1123页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the Key R&D Program of Zhejiang Province,China(2021C01002) the National Natural Science Foundation of China(11874320,12034017,11874137,and 11974306) the National Key R&D Program of China(2017YFA0303100) Zhejiang Provincial Natural Science Foundation of China(R22A0410240) 

主　　题：自旋轨道耦合 超导转变温度 密度泛函理论计算 超导能隙 非中心对称 超导电性 立方晶体 上临界磁场 

摘      要：本文报道了非中心对称化合物家族La_(4)TX(T=Ru,Rh,Ir;X=Al In)中的超导电性.该系列超导体具有立方晶体结构,空间群为F 43m La_(4)RuAl,La_(4)RhAl,La_(4)IrAl,La_(4)RuIn和La_(4)IrIn的超导转变温度在0.61–3.35 K之间,而La_(4)RuIn尚未被成功制备.La_(4)RuAl和La_(4)RhAl的低温比热可由无超导能隙节点的s波超导描述,而自旋-轨道耦合强度较大的La_(4)IrAl则可能存在能隙节点.这些超导体的上临界磁场都可由Werthamer-Helfand-Hohenberg模型描述,且上临界场Hc2(0)远低于泡利极限,说明轨道效应在库伯对拆对机制中占据主导.密度泛函理论计算表明,对于该超导家族的不同化合物,其反对称自旋-轨道耦合导致的能带劈裂存在明显区别,有助于进一步探究超导配对态与反对称自旋-轨道耦合强度之间的联系.