Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Superconductivity - Vortex Dynamics, Vortex Phases, Pinning
TT 34.6: Vortrag
Freitag, 30. März 2007, 11:30–11:45, H19
MgB2 - a self organised critical system — •Andreas Heinrich1, Emmeram Stark1, Monika Panhans1, Bernd Stritzker1, and Rudolf Schneider2 — 1Universität Augsburg, EPIV, 86135 Augsburg — 2Forschungszentrum Karlsruhe, IFP, Karlsruhe
Systems like a sand hill or water droplets are treated in terms of a self organised critical system. Thereby several conditions apply for such a system: it should consist of many components, it should organise itself into a critical state, there should be an exceptional event - like an avalanche, this events should be invariant in time and scale, etc. Here we would like to present magneto optical investigations of flux penetration into MgB2 thin films. Thereby one can differ between a homogeneous and an avalanche like flux penetration. We will show that especially the avalanche like flux penetration can be treated like a self organised critical system. In comparison with a sand hill we will demonstrate the avalanche or dendrite flux formation in MgB2 exhibit all requirements mentioned above.