Superconductivity of Y2C3 investigated by specific heat measurement
Superconductivity of Y2C3 investigated by specific heat measurement
复制标题
DOI：
10.1143/jpsj.76.024713
复制
发表时间：
2007-02-01
影响因子：
1.7
通讯作者：
Akimitsu, Jun
中科院分区：
文献类型：
--
作者：
Akutagawa, Satoshi;Akimitsu, Jun
本文报道了新合成的高纯Y_2C_3样品，它们具有不同的T_c（11.6，13.9和15.2K），并通过磁化强度和比热测量比较了它们的超导性能。根据比热测量，每个样品的电子比热低于T-c的拟合具有由BCS理论预测的exp（-1/T）依赖性，而不是具有超导性的各向异性对称性的超导体的T-n依赖性。这些结果表明，Y_2C_3超导的对称性是各向同性s波。根据T-c以下的拟合，我们估计11、13和15 K样本的2 Delta/k（B）T（c）分别为3.6、3.9和4.1。我们发现Y_2C_3的T_c与索末菲系数相关，并且高T_c材料比低T_c材料处于更强的耦合区。
We report newly synthesized high-purity samples Of Y2C3 with various T-c's (11.6, 13.9, and 15.2 K) and compared their superconducting properties by magnetization and specific heat measurements. From specific heat measurements, the fitting below T-c to the electron specific heat of each sample has an exp(-1/T) dependence, as predicted by BCS theory, rather than a T-n dependence, as for superconductors with an anisotropic symmetry of superconductivity. These results indicate that the symmetry of the superconductivity Of Y2C3 is that of an isotropic s-wave. From the fitting below T-c, we estimated 2 Delta/k(B)T(c), to be 3.6, 3.9, and 4.1 for the 11, 13, and 15 K samples, respectively. We found that T, Of Y2C3 was correlated to the Sommerfeld coefficient, and that the high-T-c, material was in a stronger coupling regime than the low-T-c, material.