Point-contact Andreev reflection measurements on ZrRuAs single crystals

Author:

Wang He1ORCID,Li Yuan1,Ji Haoran2ORCID,Luo Jiawei2ORCID,Yan Dayu3,Shi Youguo3,Wang Jian24567ORCID

Affiliation:

1. Department of Physics, Capital Normal University 1 , Beijing 100048, China

2. International Center for Quantum Materials, School of Physics, Peking University 2 , Beijing 100871, China

3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science 3 , Beijing 100190, China

4. Collaborative Innovation Center of Quantum Matter 4 , Beijing 100871, China

5. Hefei National Laboratory 5 , Hefei 230088, China

6. Beijing Academy of Quantum Information Sciences 6 , Beijing 100193, China

7. CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences 7 , Beijing 100190, China

Abstract

ZrRuAs single crystals with hexagonal crystal structure, which is a kind of non-centrosymmetric superconductor with relatively high transition temperature, is predicted to be a topological superconductor candidate. To explore the exotic properties of ZrRuAs, the superconducting gap of ZrRuAs needs to be measured. In this work, point-contact Andreev reflection (PCAR) spectroscopy is used to investigate the superconductivity of ZrRuAs single crystals. The double conductance peaks in the PCAR spectra are observed along different crystal directions. The superconducting gap can be quantitatively analyzed by using the modified Blonder–Tinkham–Klapwijk model based on the s-wave superconductivity. The temperature dependence of the extracted superconducting gap follows the Bardeen–Cooper–Schrieffer theory. Our results suggest the isotropic s-wave superconductivity in ZrRuAs.

Publisher

AIP Publishing

Subject

General Physics and Astronomy,Physics and Astronomy (miscellaneous)

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