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

In this study, we report bulk superconductivity (SC) in Ca3Ir4Sn13 by means of 119Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate (1/T1), namely the Hebel–Slichter coherence peak just below the Tc, and the exponential decay in the superconducting phase, are evident. The noticeable decrease of 119Sn Knight shift below Tc indicates spin-singlet superconductivity. The temperature dependence of the spin-lattice relaxation rate 119(1/T1) is convincingly described by the multigap isotropic superconducting gap. NMR experiments do not witness any sign of enhanced spin fluctuations.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [1]
  1. TU Dresden, Dresden (Germany). Institute for Solid State Physics.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
OSTI Identifier:
1235863
Report Number(s):
BNL--111655-2015-JA
Journal ID: ISSN 0921-4526; R&D Project: PM016; KC0201050
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physica. B, Condensed Matter
Additional Journal Information:
Journal Volume: 479; Journal Issue: C; Journal ID: ISSN 0921-4526
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY NMR; BCS superconductivity; multigap