|Home||<< 1 >>|
Kim, J., N. Haberkorn, E. Nazaretski, R. de Paula, T. Tan, X. X. Xi, T. Tajima, R. Movshovich, and L. Civale. "Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film." Solid State Communications 204 (2015): 56–60.
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 Î»=50Â±10 nm at T=4 K is related to a clean Ï€-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 Ï€-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Andersonâ€“Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.