super(119)Sn-NMR investigations on superconducting Ca sub(3)Ir sub(4)Sn sub(13): Evidence for multigap superconductivity

We report bulk superconductivity (SC) in Ca sub(3)Ir sub(4)Sn sub(13) by means of super(119)Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate (1/T sub(1)), namely the Hebel-Slichter coherence peak just below the Tc, and...

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Published inPhysica. B, Condensed matter Vol. 479; pp. 51 - 53
Main Authors Sarkar, R, Bruckner, F, Gunther, M, Wang, Kefeng, Petrovic, C, Biswas, P K, Luetkens, H, Morenzoni, E, Amato, A, Klauss, H-H
Format Journal Article
LanguageEnglish
Published 15.12.2015
Subjects
Coherence
Condensed matter
Fluctuation
Knight shift
Nuclear magnetic resonance
Spin-lattice relaxation
Superconductivity
Temperature dependence
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Summary:We report bulk superconductivity (SC) in Ca sub(3)Ir sub(4)Sn sub(13) by means of super(119)Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate (1/T sub(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 super(119)Sn Knight shift below T sub(c) indicates spin-singlet superconductivity. The temperature dependence of the spin-lattice relaxation rate super(119)(1/T sub(1)) is convincingly described by the multigap isotropic superconducting gap. NMR experiments do not witness any sign of enhanced spin fluctuations.
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ISSN:0921-4526
DOI:10.1016/j.physb.2015.09.030