Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique

TT 32.23: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Thermalization of energy in superconducting absorbers far from equilibrium: an experimental approach — •Loredana Fleischmann, Richard Weldle, Philipp Ranitzsch, Jan-Patrick Porst, Andreas Fleischmann, and Christian Enss — Universität Heidelberg, Kirchhoff Institut für Physik, INF 227, 69120 Heidelberg

The use of superconducting energy absorbers for low temperature micro-calorimeters offers several advantages like the possibility to have high stopping power together with low heat capacity. Due to a still not well understood thermalization of the energy released by the interacting particle, the use of superconducting absorbers is present only in special cases. We investigated by means of magnetic calorimeters the time response of the detector signal upon the absorption of x-rays in a superconducting absorber. Metallic magnetic calorimeters are low temperature energy dispersive detectors composed by an energy absorber well thermally connected to a paramagnetic temperature sensor which resides in a small magnetic field. The change of magnetization following the absorption of energy is measured as a change of flux in a low noise high bandwidth dc-SQUID. In particular we investigated absorbers made of rhenium, aluminum and aluminum doped with 600ppm manganese. The experiments using the Al and Al:Mn were performed in order to understand the role of magnetic impurities in the thermalization of energy. We discuss the temperature dependence of the energy thermalization in superconducting absorbers at the light of presently available theories.