Evidence for Strong-Coupling s-Wave Superconductivity in MgB2: 11B NMR Study

H. Kotegawa, K. Ishida, Y. Kitaoka, T. Muranaka, Jun Akimitsu

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2 Citations (Scopus)

Abstract

We have investigated a gap structure in a newly discovered superconductor, MgB2, through measurement of the 11B nuclear spin-lattice relaxation rate, 11(1/T1). 11(1/T1) is proportional to the temperature (T) in the normal state, and decreases exponentially in the superconducting (SC) state, revealing a tiny coherence peak just below Tc. The T dependence of 1/T1 in the SC state can be accounted for by an s-wave SC model with a large gap size of 2Δ/kBTc∼5 which suggests it is in a strong-coupling regime.

Original languageEnglish
JournalPhysical Review Letters
Volume87
Issue number12
DOIs
Publication statusPublished - Aug 28 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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