Electron-phonon superconductivity in noncentrosymmetric LaNiC 2 : First-principles calculations
Electron-phonon superconductivity in noncentrosymmetric LaNiC 2 : First-principles calculations
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DOI：
10.1103/physrevb.80.092506
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发表时间：
2009-05
影响因子：
3.7
通讯作者：
A. Subedi;D. Singh
中科院分区：
文献类型：
--
作者：
A. Subedi;D. Singh
本文报道了非中心对称超导体LaNiC_{2}的电子结构和电子-声子耦合的第一性原理计算。这表明该材料是一种具有中等耦合的常规电子-声子超导体。有两个低频C非键伸缩模式，其中一个具有很强的Kohn异常耦合的贡献大。由于${\text{LaNiC}}_{2}$缺乏反演对称性，因此该对是占主导地位的$s$波型，并带有一些$p$波特征的混合。这将给出比热的指数衰减。
We report first-principles calculations of the electronic structure and electron-phonon coupling in the noncentrosymmetric superconductor ${\text{LaNiC}}_{2}$. These show that the material is a conventional electron-phonon superconductor with intermediate coupling. There are large contributions to the coupling by two low-frequency C nonbond-stretching modes, one of which has strong Kohn anomalies. Since ${\text{LaNiC}}_{2}$ lacks inversion symmetry, the pairing is of dominant $s$-wave type with some mixture of $p$-wave character. This will give exponential decay in the specific heat.