Evidence for strong-coupling s-wave superconductivity in MgB2:: 11B NMR study -: art. no. 127001

被引：145

作者：

Kotegawa, H ^{[1
]}

Ishida, K

Kitaoka, Y

Muranaka, T

Akimitsu, J

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Dept Phys Sci, Osaka 5608531, Japan

[2] Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 1578572, Japan

[3] Japan Sci & Technol Corp, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.87.127001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated a gap structure in a newly discovered superconductor, MgB2, through measurement of the B-11 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(B)T(c) similar to 5 which suggests it is in a strong-coupling regime.

引用

页数：4

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