MAGNETIZATION OF MESOSCOPIC SUPERCONDUCTING DISKS
MAGNETIZATION OF MESOSCOPIC SUPERCONDUCTING DISKS
复制标题
DOI：
10.1103/physrevlett.79.4653
复制
发表时间：
1997-07
影响因子：
8.6
通讯作者：
P. Deo;V. Schweigert;F. Peeters;A. Geim
中科院分区：
文献类型：
--
作者：
P. Deo;V. Schweigert;F. Peeters;A. Geim
Ginzburg-Landau方程和三维Maxwell方程的耦合解揭示了超导小粒子的有趣的磁响应，与二维近似有质的不同，但与最近的实验相一致。根据半径和厚度的不同，从正常到超导态可以发现一级或二级相变。对于足够大的圆盘半径，得到了对应于不同角动量巨涡状态的超导相的几个相变。为了与这些跳跃的位置和大小以及磁化曲线的线形和大小保持一致，在计算中加入有限厚度是至关重要的。
Solutions of Ginzburg-Landau equations coupled with three-dimensional Maxwell equations reveal an intriguing magnetic response of small superconducting particles, qualitatively different from the two-dimensional approximation but in agreement with recent experiments. Depending on the radius and thickness, first or second order transitions are found for the normal to superconducting state. For a sufficiently large radius of the disk, several transitions in the superconducting phase are obtained which correspond to different angular momentum giant vortex states. The incorporation of the finite thickness in the calculation is crucial in order to obtain agreement with the position and the size of these jumps, and the line shape and magnitude of the magnetization curves.