Resumo

BARBA-ORTEGA, José José; GONZALEZ, Jesús D.  e  RINCON-JOYA, Miryam. Simple theoretical proposal of the dependence of the deGennes extrapolation parameter with the surface temperature of a superconducting sample. TecnoL. [online]. 2019, vol.22, n.45, pp.4-10. ISSN 0123-7799.  https://doi.org/10.22430/22565337.1301.

The Time-dependent Ginzburg-Landau model (TDGLM) is a robust tool widely used to analyze the magnetization of the single-vortex state of a mesoscopic superconducting sample in presence of a magnetic field. The algorithm implemented in this work is applied to a square geometry surrounded by different kinds of materials simulated by deGennes extrapolation length b. The inside of the sample remains at constant temperature Ti, while its boundary remains at temperature Ts. This temperature variation in the sample can be generated by a continuous laser wave injected into all the internal points, except for a thin surface layer in the boundary of the material. We found that the b value at Ts = Ti = 0.0, which mimics the magnetization curve for a corresponding Ts, presents a linear dependence with the temperature. Therefore, although within the domain of validity TDGLM the parameter b is to be considered temperature-independent in the vicinity of the bulk critical temperature and that b depends on the density of states near the surface, we propose a simple dependence of b using a TDGLM.

Palavras-chave : Time-dependent Ginzburg-Landau equations; deGennes parameter; Superconductor; Mesoscopic; Magnetization..

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