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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.12: Vortrag

Freitag, 30. März 2012, 12:30–12:45, H 2053

The role of thermal conductivity on the nucleation and propagation of magnetic flux avalanches — •Claudia Stahl1, Sebastian Treiber1, and Joachim Albrecht21Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart — 2Hochschule Aalen, Beethovenstraße 1, 73430 Aalen

Below a certain threshold temperature the critical state of superconducting thin films can get unstable, which results in large magnetic flux avalanches. In thin MgB2 films with an inhomogeneous current density distribution both the nucleation and propagation of magnetic flux avalanches are highly favoured [1].

Magnetization measurements and magneto - optical imaging are used to characterize inhomogeneous MgB2 thin films.

Avalanches occur when the thermal transport gets much slower than the transport by electric conductivity. Increasing the thermal conductivity by a gold cover layer leads to a suppression of the instabilities. It is investigated how the two steps of the avalanche process, nucleation and propagation, are influenced by the thermal conductivity in inhomogeneous MgB2 thin films. We found that the gold layer in particular influences the initial phase of the avalanche formation.
S. Treiber, C. Stahl, G. Schütz, and J. Albrecht, Physical Review B 84, 094533 (2011).

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DPG-Physik > DPG-Verhandlungen > 2012 > Berlin