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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.