Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Superconductivity: Poster Session
TT 21.53: Poster
Montag, 16. März 2015, 15:00–18:00, Poster B
Microfabricated Thick Proximity Bi-layers as Sensors for Magnetic Penetration Thermometers (MPTs) — •J. Geist, D. Hengstler, M. Keller, M. Krantz, C. Schötz, S. Kempf, L. Gastaldo, A. Fleischmann, and C. Enss — Kirchhoff-Institute for Physics - Heidelberg University
Metallic magnetic calorimeters for high resolution x-ray spectroscopy use dilute paramagnetic alloys as temperature sensors operated at a temperature of 20 mK. Recent prototypes for soft x-rays achieved an energy resolution of 1.6 eV(FWHM) for 6 keV photons. To reach a similar resolution at higher and easy accessible temperatures, we are presently investigating superconducting sensor materials. Thereby the steep temperature dependence of the magnetic penetration depth is used in the superconducting transition as temperature information. A technically interesting class of materials might be proximity bi-layers consisting of a thick normal metal layer and a superconductor. This combination might allow to tune not only Tc, but also the transition width and therefore the dynamic range. We present first results of measurements were a thick gold and silver layer is deposited onto aluminum. The bi-layers are patterned to form meander-shaped coils, where the temperature dependence of the coil inductance was studied in inductance bridge circuits with SQUID readout. We present data for different structure sizes and discuss the resulting expected signal height and energy resolution.