Resumo

BARBA-ORTEGA, José José  e  RINCON-JOYA, Miryam. Configuración de Vórtices en Películas Finas: Teoría Ginzburg-Landau No Lineal. TecnoL. [online]. 2011, n.27, pp.89-102. ISSN 0123-7799.

In this work, we investigated theoretically the Shubnikov state in a superconducting film with square cross section with a defect inserted in the center. The sample is immersed in a uniform and homogeneous magnetic field applied perpendicular to its plane. We assume that the internal defect is filled with a metallic material. The presence of such material is simulated by the boundary conditions of de Gennes, via the extrapolation length, parameter b> 0. Using the time-dependent Ginzburg-Landau theory with the Link variable method, we analyze the vortex number, supercurrents, magnetization curves and free energy as function of the applied magnetic field. Spontaneously a vortex-anti-vortex pair (V-AV) interaction into the sample can appears. This interaction can occur inside or outside the metal defect. We see that the VAV pair annihilation occurs closer the defect when b→0 (more metallic material).

Palavras-chave : De Gennes parameter; Ginzburg-Landau; mesoscopic; link variable.

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