Vortex patterns and nucleation of superconductivity in mesoscopic rectangles and

2019-08-14 08:21:14

patterns TC dot rectangles

责任者: Moshchalkov, V.V.;Morelle, M.;Teniers, G.;Golubovic, D.S. 单位: Nanoscale Super.Conduct./Magnet. G., Lab. for Solid State Phys./Magnet., 3001 Leuven, Belgium 来源出处: European Physical Journal B,2004,40(4):471-478 摘要: Nucleation of superconductivity and vortex patterns have been studied in mesoscopic samples providing the crossover between square and rectangular geometries. The measured nucleation line, TC(H), has been analyzed in the framework of the linearized Ginzburg-Landau theory. A very good agreement has been found between the theoretical TC(H) boundary and the experimental data for rectangles with different aspect ratios. The superconductor/ferromagnet hybrids, such as magnetic Co/Pd dot in a superconducting loop and the dot on top of a superconducting disk have also been investigated. Pronounced effects of the dot on the TC(H) boundary have been found, including strong asymmetry with respect to the field polarity. 关键词: Superconducting materials;Ferromagnetic materials;Nucleation;Superconductivity;Linearization;Aspect ratio;Cobalt;Palladium;Phase diagrams;Boundary conditions;Superconductivity phase diagrams;Mesoscopic rectangles;Nanoscale systems;Vortex patterns