Resumo

BARBA ORTEGA, JOSE JOSE. CONFINEMENT EFFECTS ON MIXED STATE IN SUPERCONDUCTING PRISMS. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.168, pp.158-163. ISSN 0012-7353.

In this article, we theoretically investigated the vortex configuration of mesoscopic samples of different geometries, imbedded in an external magnetic field. We use the Ginzburg-Landau theory to obtain the spatial distribution of the superconducting electron density in long prisms with a square and triangular cross-section. Taking into account de Gennes boundary conditions via the extrapolation length, b, we study the properties of a mesoscopic superconducting square surrounded by different materials (metallic and another superconductor at higher critical temperature) in the presence of an external magnetic field applied perpendicularly to the square surface. The b-limit for the occurrence of a single vortex in the sample of area d2 is determined. Also, we obtain the vortex configurations for a mesoscopic triangle with the magnetic field applied perpendicularly to a sample plane. In most of the configurations, the vortices present twofold or threefold symmetry.

Palavras-chave : Mesoscopics; Ginzburg-Landau; molecular dynamics; de Gennes parameter.

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