Electronic state around vortex in a two-band superconductor
Electronic state around vortex in a two-band superconductor
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DOI：
10.1103/physrevb.70.144508
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发表时间：
2004-09
影响因子：
3.7
通讯作者：
M. Ichioka;K. Machida;N. Nakai;P. Miranović
中科院分区：
文献类型：
--
作者：
M. Ichioka;K. Machida;N. Nakai;P. Miranović
基于准经典理论，研究了MgB_2中三维费米表面小间隙和准二维表面大间隙的双带超导体的涡旋态。比较了平行和垂直于ab平面的场对态零能量密度的场依赖性，讨论了平行场中涡旋核形状的各向异性。两波段的费米表面几何，结合高场下类正态电子态对小间隙带的影响，产生了c-和ab-方向各向异性的特征行为。
Based on the quasiclassical theory, we investigate the vortex state in a two-band superconductor with a small gap on a three dimensional Fermi surface and a large gap on a quasi-two dimensional one, as in MgB_2. The field dependence of zero-energy density of states is compared for fields parallel and perpendicular to the ab plane, and the anisotropy of the vortex core shape is discussed for a parallel field. The Fermi surface geometry of two-bands, combining the effect of the normal-like electronic state on the small gap band at high fields, produces characteristic behavior in the anisotropy of c- and ab-directions.