Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor
Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor
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DOI：
10.1103/physrevb.70.100503
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发表时间：
2004-03
影响因子：
3.7
通讯作者：
N. Nakai;P. Miranovi'c;M. Ichioka;K. Machida
中科院分区：
文献类型：
--
作者：
N. Nakai;P. Miranovi'c;M. Ichioka;K. Machida
理论上表明，混合态的索末菲系数$\gamma（B）$包含了超导体中差距拓扑的有用信息.我们准确地评估$\gamma（B）$对磁感应强度$B$通过使用微观准经典理论。{$\gamma（\propto B）$}中相对于$B {\rm c2}$的线性部分及其在低场中的斜率忠实地对应于差距各向异性，从而可以区分节间隙和各向异性全间隙，并估计出差距各向异性的大小。
It is shown theoretically that the Sommerfeld coefficient $\gamma(B)$ in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate $\gamma(B)$ against magnetic induction $B$ by using microscopic quasi-classical theory. The linear portion in {$\gamma(\propto B)$} relative to $B_{\rm c2}$ and its slope in low field faithfully corresponds to the gap anisotropy, so that we can distinguish the nodal gap and the anisotropic full gap, and estimate the magnitude of the gap anisotropy.