Sn-119-NMR investigations on superconducting Ca3Ir4Sn13: Evidence for multigap superconductivity

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • R. Sarkar - , Technische Universität Dresden (Author)
  • F. Brueckner - , TUD Dresden University of Technology (Author)
  • M. Guenther - , TUD Dresden University of Technology (Author)
  • Kefeng Wang - , Brookhaven National Laboratory (Author)
  • C. Petrovic - , Brookhaven National Laboratory (Author)
  • P. K. Biswas - , Paul Scherrer Institute (Author)
  • H. Luetkens - , Paul Scherrer Institute (Author)
  • E. Morenzoni - , Paul Scherrer Institute (Author)
  • A. Amato - , Paul Scherrer Institute (Author)
  • H-H. Klauss - , Technische Universität Dresden (Author)

Abstract

We report bulk superconductivity (SC) in Ca3Ir4Sn13 by means of Sn-119 nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate (1/T-1), namely the Hebel-Slichter coherence peak just below the Tc, and the exponential decay in the superconducting phase, are evident. The noticeable decrease of Sn-119 Knight shift below T-c indicates spinsinglet superconductivity. The temperature dependence of the spin-lattice relaxation rate (119)(1/T-1) is convincingly described by the multigap isotropic superconducting gap. NMR experiments do not witness any sign of enhanced spin fluctuations. (C) 2015 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)51-53
Number of pages3
JournalPhysica B: Condensed Matter
Volume479
Publication statusPublished - 15 Dec 2015
Peer-reviewedYes

Keywords

Keywords

  • NMR, BCS superconductivity, Multigap

Library keywords