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

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

2001-02-19

arxiv.org/abs/cond-mat/0102334v1

Physics

Condensed Matter

Superconductivity

2 pages with 1 figure

Scientific paper

10.1103/PhysRevLett.87.127001

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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