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Abstract
The origin of the resistive transition broadening of superconducting MgB2 thin films is investigated. Thermally activated flux flow is found to be responsible for the resistivity in the vicinity of the critical temperature. The activation energy for flux motion is observed to have an extraordinary strong dependence on the magnetic field. The results are discussed.
Acknowledgements
The authors are grateful to P. Ziemann, J. Eisenmenger, E.-H. Brandt and A. Zaikin for useful discussions, and to A. Rossolenko and O. Kroemer for experimental assistance, as well as to the A. v. Humboldt Foundation for the donation of “Coolpower-4.2GM” and “PLN-106” refrigerators. This work was partially supported by BMBF, Project Nr. MDA02/002 and by the Deutsche Forschungsgemeinschaft within the DFG-Center for Functional Nanostructures CFN as well as by INTAS, Project Nr. 03-55-1856.
