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TT: Tiefe Temperaturen

TT 36: Superconductivity - Vortex Dynamics, Vortex Phases, Pinning

TT 36.3: Vortrag

Mittwoch, 9. März 2005, 10:30–10:45, TU H2053

Dendrite Propagation Velocity in Type-II Superconductors — •Bernd-Uwe Runge¹, Björn Biehler¹, Roman Mints², and Paul Leiderer¹ — ¹University of Konstanz, Germany — ²Tel-Aviv University, Israel

We use the Faraday effect in combination with ultra-short fs-laser pulses to investigate the flux dynamics in type-II superconductors upon sudden heating. Under certain conditions a dendritic instability develops in those systems. The penetration velocity is measured using a pump-probe technique. A theory is proposed explaining the observed velocities. The theory is based on experimental observations and treats the dendrite as a moving flux jump instability. We can explain the observed fast and the well distinct slow regimes of flux penetration [1].

[1] U. Bolz et al., Europhys. Lett. 64(4) 517 (2003)