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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.33: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Broadband dielectric spectroscopy on multiferroic compounds — •Daniel Niermann, Max Schalenbach, Christoph Grams, Florian Waschkowski, and Joachim Hemberger — II. Physikalisches Institut, Universität zu Köln, Deutschland

Studying the dynamic dielectric response of given materials provides extensive insight in charge-carrier properties and involved relaxation processes. It was recently shown on the example of the perovskite rare-earth manganites that the occurrence of the multiferroic phase transition is often coupled to characteristic changes of relaxation dynamics [1]. We studied the frequency dependent dielectric properties of the multiferroic compounds LuFe₂O₄ and MnWO₄. To cover a wide frequency range from mHz to several GHz different setups for low-frequency impedance analysis and microwave spectroscopy were used. For the microwave regime we show transmission-measurements using a new microstrip-sampleholder, which allows a high measuring sensitivity for high-impedance samples. The measurements are performed at cryogenic temperatures down to 1.8K and high magnetic fields up to 14T. This work was supported by the DFG through SFB 608.
F. Schrettle et al., Phys. Rev. Lett., 102 (2009) 207208