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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.6: Vortrag

Donnerstag, 26. März 2009, 16:30–16:45, HSZ 103

Multiferroicity in Cu₂OSeO₃ studied by Raman scattering — •Vladimir Gnezdilov^1,2, Peter Lemmens², Yurii Pashkevich³, Dietrich Wulferding², and Hemuth Berger⁴ — ¹ILTP, Kharkov, Ukraine — ²IPKM, TU Braunschweig, Germany — ³Donetsk Phystech, Ukraine — ⁴IPMC, Lausanne, Switzerland

The lone pair piezoelectric ferrimagnet Cu₂OSeO₃ is a unique example of a metrically cubic material that allows linear magnetoelectric coupling as well as piezoelectric and piezomagnetic coupling [1]. The metric cubic lattice excludes a magnetoelectric coupling mechanism involving spontaneous lattice strains. Raman spectra show drastic changes below Tc, namely the appearance of new lines, the splitting of some lines, and anomalies in their temperature behaviour. These observations are discussed in terms of a symmetry reduction and magnetic excitations.

[1]. J.-W. G. Bos, C.V. Colin, and T.T.M. Palstra, arXiv:0808.5955.