Specific heat and low-lying excitations in the mixed state for a type-II superconductor
Specific heat and low-lying excitations in the mixed state for a type-II superconductor
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DOI：
10.1103/physrevb.73.172501
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发表时间：
2006-04
影响因子：
3.7
通讯作者：
N. Nakai;P. Miranović;M. Ichioka;K. Machida
中科院分区：
文献类型：
--
作者：
N. Nakai;P. Miranović;M. Ichioka;K. Machida
用Eilenberger理论自洽计算了混合态电子比热的低温行为。在涡旋状态下，除了$EnsureMath{\Gamma}T$项($\EnsureMath{\Gamma}$是Sommerfeld系数)外，$C(T)$还有一个重要的贡献：${T}^{2}$项。我们将${T}^{2}$项的起源确定为(I)涡旋态的V型态密度和(Ii)涡核在降低$T时收缩的Kramer-Pesch效应。对于全间隙和线节两种情况，这些结果都揭示了涡核是一种比正常核图更丰富的电子结构。
Low temperature behavior of the electronic specific heat $C(T)$ in the mixed state is by the self-consistent calculation of the Eilenberger theory. In addition to the $\ensuremath{\gamma}T$-term ($\ensuremath{\gamma}$ is a Sommerfeld coefficient), $C(T)$ has a significant contribution of ${T}^{2}$-term intrinsic in the vortex state. We identify the origin of the ${T}^{2}$ term as (i) V-shape density of states in the vortex state and (ii) the Kramer-Pesch effect of vortex-core shrinking upon lowering $T$. These results for both full-gap and line-node cases reveal that the vortex core is a richer electronic structure beyond the normal core picture.