Superconducting properties of noncentrosymmetric superconductor CaIrSi3 investigated by muon spin relaxation and rotation

Benjamin A. Frandsen, Sky C. Cheung, Tatsuo Goko, Lian Liu, Teresa Medina, Timothy S. J. Munsie, Graeme M. Luke, Peter J. Baker, Marco P. Jimenez S., Gaku Eguchi, Shingo Yonezawa, Yoshiteru Maeno, and Yasutomo J. Uemura
Phys. Rev. B 91, 014511 – Published 23 January 2015

Abstract

We have employed muon spin relaxation and rotation (μSR) to investigate the superconducting properties of the noncentrosymmetric superconductor CaIrSi3. Measurements of single-crystal specimens confirm the development of a robust superconducting state below Tc=3.55±0.1K with a ground-state magnetic penetration depth of λL=288±10nm and a coherence length of ξ=28.8±0.1nm. The temperature evolution of the superfluid density indicates a nodeless superconducting gap structure dominated by an isotropic spin-singlet component in the dirty limit with a carrier density of n=(4.6±0.2)×1022cm3 as determined by Hall resistance measurements. We find no evidence of spontaneous time-reversal symmetry breaking in the superconducting state within an accuracy of 0.05 G. These observations suggest that the influence of any spin-triplet pairing component or multiple gap structure associated with noncentrosymmetric physics is very weak or entirely absent in CaIrSi3.

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  • Received 30 August 2014
  • Revised 27 November 2014

DOI:https://doi.org/10.1103/PhysRevB.91.014511

©2015 American Physical Society

Authors & Affiliations

Benjamin A. Frandsen1, Sky C. Cheung1, Tatsuo Goko2, Lian Liu1, Teresa Medina3, Timothy S. J. Munsie3, Graeme M. Luke3,4, Peter J. Baker5, Marco P. Jimenez S.6, Gaku Eguchi7, Shingo Yonezawa6, Yoshiteru Maeno6, and Yasutomo J. Uemura1,*

  • 1Department of Physics, Columbia University, New York, New York 10027, USA
  • 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 3Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
  • 4Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
  • 5ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom
  • 6Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 7Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan

  • *tomo@lorentz.phys.columbia.edu

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Vol. 91, Iss. 1 — 1 January 2015

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