Evidence for s-wave superconductivity in noncentrosymmetric Re24Nb5 from 93Nb NMR measurements

被引：26

作者：

Lue, C. S. ^{[1
]}

Su, T. H. ^{[1
]}

Liu, H. F. ^{[1
]}

Young, Ben-Li ^{[2
]}

机构：

[1] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan

[2] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.84.052509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a Nb-93 nuclear magnetic resonance (NMR) study on the noncentrosymmetric superconductor Re24Nb5. Below the superconducting temperature T-c(H), the spin susceptibility probed by the Nb-93 NMR Knight shift gradually decreases with lowering temperature, accompanied by the broadening of the resonance spectrum. Such behavior is commonly observed in the BCS-type superconductors. The Nb-93 NMR spin-lattice relaxation rate (1/T-1) shows a well-defined coherence peak just below T-c(H), followed by a marked decrease with further decreasing temperature. Moreover, the 1/T-1 data in the superconducting state were found to obey a single exponential expression, yielding a nodeless gap Delta/kB = 10.3 K. This value gives the ratio of 2 Delta/kBT(c)(H) = 3.55, that is almost identical with the value of 3.5 predicted from BCS theory. On these bases, we conclude that the noncentrosymmetric Re24Nb5 compound can be characterized as a weakly coupled BCS-type superconductor.

引用

页数：4

共 39 条

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