Superconducting and magnetic properties of Sr3Ir4Sn13

P. K. Biswas, A. Amato, R. Khasanov, H. Luetkens, Kefeng Wang, C. Petrovic, R. M. Cook, M. R. Lees, and E. Morenzoni
Phys. Rev. B 90, 144505 – Published 10 October 2014

Abstract

Magnetization and muon spin rotation and relaxation (μSR) measurements have been performed to study the superconducting and magnetic properties of Sr3Ir4Sn13. From magnetization measurements the lower and upper critical fields T=0K are found to be 8.5(1) mT and 1.44(2) T, respectively. Zero-field μSR data show no sign of any magnetic ordering or weak magnetism. Transverse-field μSR measurements in the vortex state provide the temperature dependence of the magnetic penetration depth λ. The temperature dependence of λ2 is consistent with the existence of a single s-wave energy gap in the superconducting state of Sr3Ir4Sn13 with a gap value of 0.82(2) meV at absolute zero temperature. However, a two-gap s+s-wave model fit with gap values of 0.91(4) and 0.14(7) meV cannot be ruled out completely. The magnetic penetration depth at zero temperature λ(0) is 291(3) nm. The ratio Δ(0)/kBTc=2.1(1) indicates that Sr3Ir4Sn13 should be considered a strong-coupling superconductor.

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  • Received 24 March 2014
  • Revised 24 September 2014

DOI:https://doi.org/10.1103/PhysRevB.90.144505

©2014 American Physical Society

Authors & Affiliations

P. K. Biswas1,*, A. Amato1, R. Khasanov1, H. Luetkens1, Kefeng Wang2, C. Petrovic2, R. M. Cook3, M. R. Lees3, and E. Morenzoni1,†

  • 1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • *pabitra.biswas@psi.ch
  • elvezio.morenzoni@psi.ch

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Issue

Vol. 90, Iss. 14 — 1 October 2014

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