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Philosophical Magazine Volume 85, 2005 - Issue 16
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Original Articles

Thermally assisted flux flow in MgB2: strong magnetic field dependence of the activation energy

A. Sidorenko * Institute of Applied Physics, MD-2028 Kishinev, Moldova; Institute of Nanotechnology (INT), Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany; Institute of Applied Physics, Universität Karlsruhe, D-76128 Karlsruhe, Germany
,
V. Zdravkov Institute of Applied Physics, MD-2028 Kishinev, Moldova; Institute of Solid State Physics, RU-142432 Chernogolovka, Russia
,
V. Ryazanov Institute of Solid State Physics, RU-142432 Chernogolovka, Russia
,
S. Horn Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
,
S. Klimm Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
,
R. Tidecks Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
,
A. Wixforth Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
,
Th. Koch Institute of Nanotechnology (INT), Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany
&
Th. Schimmel Institute of Nanotechnology (INT), Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany; Institute of Applied Physics, Universität Karlsruhe, D-76128 Karlsruhe, Germany
 show all
Pages 1783-1790 | Received 01 Jun 2004, Accepted 04 Dec 2004, Published online: 21 Feb 2007
 
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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.

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