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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 |
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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.
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Received: 19 September 2023
Revised: 10 October 2023
Accepted manuscript online: 13 October 2023
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PACS:
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74.25.fc
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(Electric and thermal conductivity)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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74.70.-b
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(Superconducting materials other than cuprates)
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| Fund: 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). |
Corresponding Authors:
Erjian Cheng, Huiqiu Yuan, Shiyan Li
E-mail: erjian_cheng@163.com;hqyuan@zju.edu.cn;shiyan_li@fudan.edu.cn
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Cite this article:
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 2023 Chin. Phys. B 32 127403
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