Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs  

作　　者：万一民 程二建 陈宇鑫 赵成成 涂成鹏 戴东喆 杨小帆 辛路 谢武 袁辉球 李世燕 Yimin Wan;Erjian Cheng;Yuxin Chen;Chengcheng Zhao;Chengpeng Tu;Dongzhe Dai;Xiaofan Yang;Lu Xin;Wu Xie;Huiqiu Yuan;Shiyan Li(State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200438,China;Leibniz Institute for Solid State and Materials Research,01069 Dresden,Germany;Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China;Shanghai Research Center for Quantum Sciences,Shanghai 201315,China)

机构地区：[1]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200438,China [2]Leibniz Institute for Solid State and Materials Research(IFW-Dresden),01069 Dresden,Germany [3]Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,China [4]Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China [5]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

出　　处：《Chinese Physics B》2023年第12期158-161,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.12174064);the National Key R&D Program of China (Grant No.2022YFA1402200);the Shanghai Municipal Science and Technology Major Project (Grant No.2019SHZDZX01)。

摘　　要：The noncentrosymmetric superconductor CaPtAs with time-reversal symmetry breaking in its superconducting state was previously proposed to host nodal superconductivity.Here,by employing ultralow-temperature thermal conductivity measurement on CaPtAs single crystal,we study its superconducting gap structure.A negligible residual linear term of thermal conductivity(κ_(0)/T)in zero magnetic field and the field dependence ofκ_(0)/T indicate that CaPtAs has multiple superconducting gaps with a dominant s-wave component.This is consistent with recent nuclear quadrupole resonance measurements on CaPtAs.Our work puts a strong constraint on the theories to describe the superconducting pairing symmetry of CaPtAs.

关 键 词：noncentrosymmetric superconductor thermal conductivity superconducting gap structure 

分 类 号：O511.3[一般工业技术—材料科学与工程] O469[理学—低温物理]