Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs

doi:10.1088/1674-1056/ad02e9

中国物理B ›› 2023, Vol. 32 ›› Issue (12): 127403-127403.doi: 10.1088/1674-1056/ad02e9

Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs

Yimin Wan(万一民)¹, Erjian Cheng(程二建)^2,†, Yuxin Chen(陈宇鑫)³, Chengcheng Zhao(赵成成)¹, Chengpeng Tu(涂成鹏)¹, Dongzhe Dai(戴东喆)¹, Xiaofan Yang(杨小帆)¹, Lu Xin(辛路)¹, Wu Xie(谢武)³, Huiqiu Yuan(袁辉球)^3,4,‡, and Shiyan Li(李世燕)^1,4,5,§

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

收稿日期:2023-09-19 修回日期:2023-10-10 接受日期:2023-10-13 出版日期:2023-11-14 发布日期:2023-11-14
通讯作者: Erjian Cheng, Huiqiu Yuan, Shiyan Li E-mail:erjian_cheng@163.com;hqyuan@zju.edu.cn;shiyan_li@fudan.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.12174064), the National Key R&D Program of China (Grant No.2022YFA1402200), and the Shanghai Municipal Science and Technology Major Project (Grant No.2019SHZDZX01).

Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs

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

Received:2023-09-19 Revised:2023-10-10 Accepted:2023-10-13 Online:2023-11-14 Published:2023-11-14
Contact: Erjian Cheng, Huiqiu Yuan, Shiyan Li E-mail:erjian_cheng@163.com;hqyuan@zju.edu.cn;shiyan_li@fudan.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.12174064), the National Key R&D Program of China (Grant No.2022YFA1402200), and the Shanghai Municipal Science and Technology Major Project (Grant No.2019SHZDZX01).

摘要/Abstract

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 (κ₀/T) in zero magnetic field and the field dependence of κ₀/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

Abstract: 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 (κ₀/T) in zero magnetic field and the field dependence of κ₀/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.

Key words: noncentrosymmetric superconductor, thermal conductivity, superconducting gap structure

中图分类号: (Electric and thermal conductivity)

74.25.fc

74.25.Jb (Electronic structure (photoemission, etc.)) 74.25.Op (Mixed states, critical fields, and surface sheaths) 74.70.-b (Superconducting materials other than cuprates)

Yimin Wan(万一民), Erjian Cheng(程二建), Yuxin Chen(陈宇鑫), Chengcheng Zhao(赵成成), Chengpeng Tu(涂成鹏), Dongzhe Dai(戴东喆), Xiaofan Yang(杨小帆), Lu Xin(辛路), Wu Xie(谢武), Huiqiu Yuan(袁辉球), and Shiyan Li(李世燕). Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs[J]. 中国物理B, 2023, 32(12): 127403-127403.

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Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs

Ultralow-temperature heat transport study of noncentrosymmetric superconductor CaPtAs

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