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Evidence for Strong-coupling S-wave Superconductivity in MgB2 :11B NMR Study

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arxiv cond-mat/0102334 v1 pith:I2P4SWWJ submitted 2001-02-19 cond-mat.supr-con

H. Kotegawa , K. Ishida , Y. Kitaoka , T. Muranaka , J. Akimitsu This is my paper · ORCID
classification cond-mat.supr-con
keywords statemgb2s-wavestrong-couplingaccountedbelowcoherencedecreases
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We have investigated a gap structure in a newly-discovered superconductor, MgB2 through the measurement of 11B nuclear spin-lattice relaxation rate, ^{11}(1/T_1). ^{11}(1/T_1) 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 T_c. The T dependence of 1/T_1 in the SC state can be accounted for by an s-wave SC model with a large gap size of 2\Delta /k_BT_c \sim 5 which suggests to be in a strong-coupling regime.

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