Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 6: High- and low-k-dielectrics (Joint Session with DS)
DF 6.1: Vortrag
Dienstag, 1. April 2014, 10:30–10:50, GER 37
Magnetoelectric effect in FeCr2S4 — •Martin Wohlauer, Stephan Krohns, Joachim Deisenhofer, Vladimir Tsurkan, and Alois Loidl — Universität Augsburg, Lehrstuhl für Experimentalphysik V, Universitätsstraße 1, 86150 Augsburg
The substance FeCr2S4 is a well investigated ferrimagnetic[1] spinel-type halfmetal[2]. Despite many publications describing effects in this compound over the last 50 years, the complex interactions of its many physical features leave many unanswered questions until today. Especially its magnetic and dielectric properties still show unreported effects. In this talk I’ll present new measurements of dielectric constants under the influence of magnetic fields up to 7 Tesla, showing a magneto-electric coupling below 10 K. Kalvius et al.[3] presented evidence for a noncollinear spin structure below 40 K. The change of є ′ by a magnetic field indicates a lowered crystal symmetry which may be caused by a helical spin configuration.
| [1] | G. Haacke et al.. J. Phys. Chem. Solids, 28:1699 – 1704 (1967). |
| [2] | M. S. Park et al.. Phys. Rev. B, 59:10018 – 10024 (1999). |
| [3] | G. M. Kalvius et al.. J. Phys.: Condens. Matter, 22:052205(2010). |