Superconductivity and strong spin-orbit coupling in a new noncentrosymmetric compound ThIrP  

作　　者：GuoRui Xiao QinQing Zhu YanWei Cui WuZhang Yang BaiZhuo Li SiQi Wu Guang-Han Cao Zhi Ren 

机构地区：[1]Department of Physics,Zhejiang University,Hangzhou 310027,China [2]School of Science,Westlake University,Hangzhou 310064,China [3]Institute of Natural Sciences,Westlake Institute for Advanced Study,Hangzhou 310064,China [4]Department of Physics,Fudan University,Shanghai 200433,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2021年第10期95-102,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：financial support by the foundation of Westlake University;supported by the National Key Research Development Program of China (Grant No. 2017YFA0303002);the Fundamental Research Funds for the Central Universities of China。

摘　　要：A new noncentrosymmetric phosphide ThIrP has been synthesized and characterized. X-ray difraction analysis shows that this compound crystallizes in a LaPtSi-type tetragonal lattice(space group I41md, Z = 4), whose lattice parameters are a = b =4.0676(1) ?, c = 14.3354(2) ?, and V = 237.191(8) ?3. Moreover, ThIrP is discovered to be an intermediately coupled,type-Ⅱ superconductor with possibly multiple gaps below Tc= 5.07 K. The upper critical magnetic field, Sommerfield coefficient, and Ginzburg-Laudau parameter are determined based on physical property measurements, which are Bc2= 0.83 T, γ =7.5 mJ mol-1 K-2, and κGL= 7.5, respectively. The electronic band structure calculations point out nearly equal contributions of Ir and Th atoms on the density of states around the Fermi surface. In addition, the spin-orbit coupling induced band splitting reaches as large as 270 meV along the Γ-Z line. Our results suggest that ThIrP provides a platform to study the interplay between inversion-symmetry breaking, strong spin-orbit coupling, and superconductivity.

关 键 词：ThIrP NONCENTROSYMMETRIC SUPERCONDUCTIVITY spin-orbit coupling 

分 类 号：O641.1[理学—物理化学]