Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Poster Session: Cryotechnique
TT 54.4: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3
Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors — •Andreas Reifenberger, Sebastian Kempf, Andreas Fleischmann, Rüdiger Klingeler, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, D-69120 Heidelberg
For the measurement of the specific heat of superconducting mg-sized metallic glass samples in the temperature range down to 10 mK we have developed a new microfabricated platform. It addresses challenging aspects of such a setup like the thermal contact between sample and platform, the necessary thermometer resolution and an addenda heat capacity excceeding that of the samples of interest (typically nJ/K @ 20 mK). Our novel setup is based on the relaxation method, where the thermal relaxation following a well defined heat pulse is monitored to extract the specific heat. The sample platform (5 × 5 mm2) includes a microstructured paramagnetic Ag:Er temperature sensor, which is read out by a dc-SQUID (Superconducting Quantum Interference Device) via a superconducting pickup loop. In this way, a relative temperature precision of 0.5 µ K can be reached. A gold-coated mounting area (4.4 × 3 mm2) is included to improve the thermal contact between sample and platform. The performance of our setup is presented and discussed.