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MA: Fachverband Magnetismus
MA 11: Multiferroics I: Structure and Phase Transitions (jointly with DF, DS, KR, TT), Program coordination: I. Mertig, M. Fiebig
MA 11.6: Talk
Monday, March 14, 2011, 16:00–16:15, HSZ 04
Investigation of multiferroic order in M3TeO6 (M=Co, Mn, Ni) by second harmonic generation — •Vera Carolus1, Thomas Lottermoser1, Sergey A. Ivanov2, Matthias Weil3, Roland Mathieu4, Matthias Hudl4, Per Nordblad4, and Manfred Fiebig1 — 1HISKP, University of Bonn, Germany — 2Department of Inorganic Materials, Karpov’ Institute of Physical Chemistry, Vorontsovo pole, 10 105064, Moscow K-64, Russia — 3Institute of Chemical Technologies and Analytics, Vienna University of Technology, Austria — 4Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden
Orthotellurates with the formula M3TeO6 are structurally well characterized and can be divided into six different structure types. According to this, these materials show a wide range of magnetic phases. Recently it was suggested, that in some of the orthotellurates multiferroic order is possible.
Among this are: Co3TeO6 (space group C2/c) and Mn3TeO6 (R3) with two magnetic phase transitions as well as Ni3TeO6 (R3) with one magnetic phase transition. However, a direct proof of ferroelectricity has not been reported so far.
Here, we investigate the multiferroic order by second harmonic generation (SHG) spectroscopy. For Co3TeO6 we measured a intense SHG contribution in the low temperature phase below 18 K, which is a strong evidence for multiferroic order. This interpretation is supported by the observation of complex domain patterns using SHG imaging techniques.