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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.83: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

Realization of a Setup for Ultrasonic Experiments under He-Gas Pressure and Test Measurements on MnF2 — •Sebastian Becker, Pham Thanh Cong, Bernd Wolf, and Michael Lang — Physikalisches Institut Goethe-Universität, SFB/TR 49; Frankfurt

Ultrasonic measurements are a powerful tool for investigating strongly correlated materials. The extension of these experiments to hydrostatic pressures, which opens up interesting possibilities for a detailed thermodynamic characterization, is challenging and has been rarely documented in the literature. Here we discuss the realization of an experimental setup, where ultrasonic measurements can be performed in a temperature range 1.2 - 300 K, at hydrostatic (He-gas) pressure values up to 10 kbar, and magnetic fields up to 16 T. The setup has been tested by measuring the ultrasonic attenuation and sound velocity on single crystalline MnF2 in the temperature range 50 K ≤ T ≤ 300 K at various pressures. From these measurements the pressure dependence of the Néel temperature was derived to (380 ± 165) mK/kbar which compares favourably with literature results.

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