Giant-vortex state induced by negatives values of deGennes parameter in a mesoscopic square

21st Latin American Symposium on Solid State Physics

González, J.D.^1,2 ; Aguilar, J.L.^1 ; Barba-Ortega, J.^2

Departamento de Física, Universidad Del Magdalena, Santa Marta, Colombia^1

Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia^2

关键词: Cooper pair;    Cooper-pair density;    External magnetic field;    Mesoscopics;    Order parameter;    Proximity effects;    Time dependent Ginzburg-Landau equations;    Vortex state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/480/1/012040/pdf
DOI  :  10.1088/1742-6596/480/1/012040

来源: IOP

【 摘 要 】

Using different negatives values of deGennes parameter in the boundary condition of a square sample superconducting type II is possible to change its vorticity. Due to the proximity effects, the cooper pairs density snapshot show how a giant vortex occurs when the external magnetic field is increased. Solving numerically the coupled nonlinear time dependent Ginzburg-Landau equations we obtain the vorticity, magnetic induction, cooper pair density, magnetization and phase of the order parameter as a function of the external magnetic field for this sample. We found that a giant vortex state occurs when a sample is surrounded by another superconductor at higher critial temperature.