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Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

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Title: Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

Author(s): Jeehoon Kim; Haberkorn, N; Nazaretski, E; de Paula, R; Tan, T; Xi, XX; Tajima, T; Movshovich, R; Civale, L

Subject: Superconducting materials, ; Films, ; Magnetic penetration depth, ; Vortex pinning

Abstract: 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 λ¼50 +_10nm at T¼4 Kis 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.