Multigap superconductivity in Y2C3:: A 13C-NMR study
Multigap superconductivity in Y2C3:: A 13C-NMR study
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DOI：
10.1143/jpsj.76.023704
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发表时间：
2007-02-01
影响因子：
1.7
通讯作者：
Akimitsu, J.
中科院分区：
文献类型：
--
作者：
Harada, A.;Akutagawa, S.;Akimitsu, J.
本文报道了用C ~（13）核磁共振（NMR）方法在磁场下研究了具有较高转变温度（Tc = 15.7K）的Y_2C_3的超导性质。C-13奈特位移揭示了低于Tc的显著降低，表明自旋单线态超导性。通过对超导态核自旋-晶格弛豫速率1/T-1的温度依赖性的分析，证明了Y_2C_3是一种多能隙超导体，在主带具有大能隙2 Δ/k（B）T（c）= 5，在其它带具有小能隙2 Δ/k（B）T（c）= 2.这些结果表明，Y_2C_3是一种独特的多能隙s波超导体，类似于MgB_2。
We report on the superconducting properties of Y2C3 with a relatively high transition temperature T-c = 15.7K investigated by C-13 nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The C-13 Knight shift has revealed a significant decrease below Tc, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T-1 in the superconducting state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2 Delta/k(B)T(c) = 5 at the main baud and a small gap 2 Delta/k(B)T(c) = 2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.