Nuclear Spin-Lattice Relaxation in Non-centrosymmetric Superconductors Li2(Pd,Pt)3B

被引：3

作者：

Kandatsu, M. ^{[1
]}

Nishiyama, M. ^{[1
]}

Inada, Y. ^{[2
]}

Zheng, Guo-qing ^{[1
]}

机构：

[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan

[2] Okayama Univ, Fac Educ, Okayama 7008530, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷

关键词：

Li2Pd3B; Li2Pt3B; superconductivity; NMR;

D O I：

10.1143/JPSJS.77SA.348

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present B-11 nuclear magnetic resonance (NMR) measurements in superconductors Li-2(Pd,Pt)(3)B without inversion symmetry. In Li2Pd3B, the spin lattice relaxation rate 1/T-1 shows a well-defined coherence peak below T-c, and follows an exponential temperature variation exp(-Delta/k(B)T) at low temperatures. At a magnetic field of 1.46 T, the energy gap Delta was found to be 1.1k(B)T(c), but it recovers to 1.5k(B)T(c) at a field of 0.44 T, which is quite close to the value 1.75k(B)T(c) for a weak coupling BCS superconductor. This behavior is in contrast to that found in Li2Pt3B where 1/T-1 is proportional to T-3, and the difference between the two compounds is ascribed to the different strength of spin orbit coupling.

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页码：348 / 349

页数：2

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