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

Sarkar, R.; Petrovic, C.; Bruckner, F.; Gunther, M.; Wang, Kefeng; Biswas, P. K.; Luetkens, H.; Morenzoni, E.; Amato, A.; Klauss, H. -H.

doi:10.1016/j.physb.2015.09.030

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

Journal Article · Fri Sep 25 00:00:00 EDT 2015 · Physica. B, Condensed Matter

DOI:https://doi.org/10.1016/j.physb.2015.09.030· OSTI ID:1235863

Sarkar, R. ^[1]; Petrovic, C. ^[2]; Bruckner, F. ^[1]; Gunther, M. ^[1]; Wang, Kefeng ^[2]; Biswas, P. K. ^[3]; Luetkens, H. ^[3]; Morenzoni, E. ^[3]; Amato, A. ^[3]; Klauss, H. -H. ^[1]

TU Dresden, Dresden (Germany). Institute for Solid State Physics.
Brookhaven National Lab. (BNL), Upton, NY (United States)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)

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 T_c, and the exponential decay in the superconducting phase, are evident. The noticeable decrease of ¹¹⁹Sn Knight shift below T_c 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1235863

Alternate ID(s):: OSTI ID: 1249624

Report Number(s):: BNL-111655-2015-JA; R&D Project: PM016; KC0201050

Journal Information:: Physica. B, Condensed Matter, Vol. 479, Issue C; ISSN 0921-4526

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (15)

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