Publicación: Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film
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Fil: Haberkorn, N. Comisión Nacional de Energía Atómica. Instituto Balseiro; Argentina
Fil: Kim, J. Institute for Basic Science; Corea; Pohang University of Science and Technology; Corea
Fil: Nazaretski, E. Brookhaven National Laboratory; Estados Unidos
Fil: de Paula, R. Los Alamos National Laboratory; Estados Unidos
Fil: Tan, T. Temple University; Estados Unidos
Fil: Xi, X.X. Temple University; Estados Unidos
Fil: Tajima, T. Los Alamos National Laboratory; Estados Unidos
Fil: Movshovich, R. Los Alamos National Laboratory; Estados Unidos
Fil: Civale, L. Los Alamos National Laboratory; Estados Unidos
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Centro Atómico Bariloche
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eng
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We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB2 thin film. The small magnetic penetration depth of λ=50±10 nm at T=4 K is related to a clean π-band. We find a high self-field critical current density Jc, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.
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Solid State Communications. Vol. 204, no. (2015), p. 56-60