Local density of states in the vortex lattice in a type-II superconductor
Local density of states in the vortex lattice in a type-II superconductor
复制标题
II 型超导体中涡晶格的局域态密度
DOI：
10.1103/physrevb.55.6565
复制
发表时间：
1996
影响因子：
3.7
通讯作者：
K. Machida
中科院分区：
文献类型：
--
作者：
M. Ichioka;N. Hayashi;K. Machida
基于准经典Eilenberger理论，研究了三角涡晶格中的局域态密度。我们考虑了具有适合于NbSe_2的材料参数的各向同性s波超导体的情况。在弱磁场下，LDOS的空间变化表现为围绕涡核的圆柱形结构。另一方面，在高场中，由于涡旋晶格效应，核心区基本重叠，LDOS为六倍星形结构。恒星的方向与扫描隧道显微镜的实验数据一致。也就是说，恒星的射线以更高（更低）的能量向最近的（下一个最近的）涡旋方向延伸。
Local density of states (LDOS) in the triangular vortex lattice is investigated based on the quasi-classical Eilenberger theory. We consider the case of an isotropic s-wave superconductor with the material parameter appropriate to NbSe_2. At a weak magnetic field, the spatial variation of the LDOS shows cylindrical structure around a vortex core. On the other hand, at a high field where the core regions substantially overlap each other, the LDOS is sixfold star-shaped structure due to the vortex lattice effect. The orientation of the star coincides with the experimental data of the scanning tunneling microscopy. That is, the ray of the star extends toward the nearest-neighbor (next nearest-neighbor) vortex direction at higher (lower) energy.