Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe2

Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara, Kazushige Machida, R. Sankar, Xiaofeng Xu, Nan Zhou, Xiangzhuo Xing, Zhixiang Shi, Sunseng Pyon, and Tsuyoshi Tamegai
Phys. Rev. B 102, 024517 – Published 21 July 2020
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Abstract

We investigate the superconducting gap function of the topological superconductor PbTaSe2. The temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the specific heat prove that the superconductivity of PbTaSe2 is fully gapped, with two isotropic s-wave gaps. The pair-breaking effect is probed by systematically increasing nonmagnetic disorders through H+ irradiation. The superconducting transition temperature Tc is found to be robust against disorders, which suggests that the pairing should be sign preserved rather than sign reversed.

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  • Received 9 April 2020
  • Revised 7 July 2020
  • Accepted 7 July 2020

DOI:https://doi.org/10.1103/PhysRevB.102.024517

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yue Sun1,2,*, Shunichiro Kittaka1,8, Toshiro Sakakibara1, Kazushige Machida3, R. Sankar4, Xiaofeng Xu5, Nan Zhou1,6, Xiangzhuo Xing6, Zhixiang Shi6, Sunseng Pyon7, and Tsuyoshi Tamegai7

  • 1Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 252-5258, Japan
  • 3Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
  • 4Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan
  • 5Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
  • 6School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China
  • 7Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 8Department of Physics, Chuo University, Bunkyo-ku, Tokyo 112-8551, Japan

  • *sunyue@phys.aoyama.ac.jp

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Issue

Vol. 102, Iss. 2 — 1 July 2020

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