Frozen magnetic response in mesoscopics superconductors

Workshop on Processing Physic-Chemistry Advanced

物理学;化学

Flórez, F Durán^1 ; V-Niño, E.D.^2,4 ; Barba-Ortega, J.^3,4

Universidad Pontificia Bolivariana, Bucaramanga, Colombia^1

Universidad Politécnica de Madrid, Madrid, Spain^2

Universidad Nacional de Colombia, Bogotá, Colombia^3

Foundation of Researchers in Science and Technology of Materials, Colombia^4

关键词: Critical magnetic field;    Ginzburg-Landau equations;    Hexagonal lattice;    Homogeneous boundary condition;    Low temperatures;    Magnetic response;    Proximity effects;    Superconducting state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/743/1/012012/pdf
DOI  :  10.1088/1742-6596/743/1/012012

来源: IOP

【 摘 要 】

For a bulk type II superconducting sample at low temperature, the magnetic field can penetrate in the form of a single quantum fluxoid, for bulk samples this fluxoides are arranged in a hexagonal lattice, this so-called Shubnikov-Abrikosov state or vortex state and takes place between the first and the second critical thermodynamics magnetic fields. Under the first magnetic critical field is present the Meissner-Oschenfeld state. For mesoscopic samples, the magnetic response can present very interesting properties due the proximity effect of in-homogeneous boundary conditions and the presence of dots, anti-dots and/or impurities. The superconducting state in a mesoscopic sample with dot/anti-dot/dot/pillar/trench is calculated within the nonlinear Ginzburg-Landau equations. We predict that the critical magnetic fields and magnetization depends on strongly of the nature, geometry, size of the defects and the boundary conditions used.