TY - JOUR
T1 - Evidence for Strong-Coupling s-Wave Superconductivity in MgB2
T2 - 11B NMR Study
AU - Kotegawa, H.
AU - Ishida, K.
AU - Kitaoka, Y.
AU - Muranaka, T.
AU - Akimitsu, J.
PY - 2001/8/28
Y1 - 2001/8/28
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.87.127001
DO - 10.1103/PhysRevLett.87.127001
M3 - Article
AN - SCOPUS:85039592392
SN - 0031-9007
VL - 87
JO - Physical Review Letters
JF - Physical Review Letters
IS - 12
ER -