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Nodeless superconductivity in noncentrosymmetric PbTaSe2 single crystals

G. M. Pang, M. Smidman, L. X. Zhao, Y. F. Wang, Z. F. Weng, L. Q. Che, Y. Chen, X. Lu, G. F. Chen, and H. Q. Yuan
Phys. Rev. B 93, 060506(R) – Published 5 February 2016

Abstract

We report an investigation of the superconducting order parameter of the noncentrosymmetric compound PbTaSe2, which is believed to have a topologically nontrivial band structure. Precise measurements of the London penetration depth Δλ(T) obtained using a tunnel diode oscillator (TDO) based method show an exponential temperature dependence at TTc, suggesting a nodeless superconducting gap structure. A single-gap s-wave model well describes the corresponding normalized superfluid density ρs(T), with a gap magnitude of Δ(0)1.88Tc. This is very close to the value of 1.76Tc for weak-coupling BCS superconductors, indicating conventional fully-gapped superconductivity in PbTaSe2.

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  • Received 13 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.060506

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

G. M. Pang1, M. Smidman1, L. X. Zhao2, Y. F. Wang1, Z. F. Weng1, L. Q. Che1, Y. Chen1, X. Lu1,3, G. F. Chen2,4, and H. Q. Yuan1,3,*

  • 1Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
  • 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
  • 4Collaborative Innovation Center of Quantum Matter, Beijing 100084, China

  • *hqyuan@zju.edu.cn

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Issue

Vol. 93, Iss. 6 — 1 February 2016

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