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Author Kim, J.; Haberkorn, N.; Nazaretski, E.; Paula, R. de; Tan, T.; Xi, X.X.; Tajima, T.; Movshovich, R.; Civale, L.
Title Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film Type Journal Article
Year 2015 Publication (up) Solid State Communications Abbreviated Journal Solid State Commun.
Volume 204 Issue Pages 56-60
Keywords A. Superconducting materials; B. Films; C. Magnetic penetration depth; D. 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 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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ISSN 0038-1098 ISBN Medium
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Call Number BT @ pedrazp @ Serial 729
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