Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.69: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

A high-resolution mK-calorimeter applying SQUID-thermometry — •Andreas Reifenberger, Norman Leps, Andreas Fleischmann, Christian Pies, Christian Enss, and Rüdiger Klingeler — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227,69120 Heidelberg, Germany

A new calorimeter for measuring single-crystalline samples of mg-size at ultra-low temperatures is described. Thermometry is done by means of a paramagnetic sensor material (Er-doped Au) in a low magnetic field. A temperature change results in a magnetization change which can be read out as change in magnetic flux by a superconducting quantum interference device (SQUID). This enables measurements in a wide temperature range (theoretically from 1 mK - 1 K) with very high sensitivities. The bolometric design exhibits low addenda heat capacity and allows measurements of heat capacities from nJ/K to µJ/K by means of a temperature-relaxation method. The performance of the device is compared to a commercially available Quantum Design calorimeter in elsewise unchanged experimental settings in the temperature range from 15 mK to 500 mK.