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Journal Article

Unusual propagation of magnetic avalanches in gold covered MgB2

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Albrecht,  J.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Matveev,  A. T.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Albrecht, J., Matveev, A. T., & Habermeier, H.-U. (2007). Unusual propagation of magnetic avalanches in gold covered MgB2. Physica C, 460, 1245-1246.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B5A8-8
Abstract
The penetration of magnetic flux lines into a type-II superconductor above the lower critical field can happen in a form of chaotic flux avalanches. Especially, in magnesium diboride films at low temperatures this phenomenon is observed. It has been shown that a thermomagnetic instability arising from local heating due to flux line motion can be considered as the origin of the effect. Studying these avalanches is realized by means of the magnetooptical Faraday effect, which allows a direct imaging of the typically dendritic magnetic structures. We show that the propagation direction of avalanches can directly be influenced by evaporating thin metallic patterns on top of a superconducting film leading to changes of the propagation velocity, the flux density distribution and the local heat transport. As a consequence a bending of the avalanche depending on the geometric shape of the metallic pattern and the incident angle of the avalanche occurs. (c) 2007 Elsevier B.V. All rights reserved.