Magnetoelectricity in the ferrimagnetic Cu2OSeO3:symmetry analysis and Raman scattering study

Автор(и)

  • V.P. Gnezdilov B.I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • K.V. Lamonova A.A. Galkin Donetsk Phystech of the National Academy of Sciences of Ukraine, Donetsk 83114, Ukraine
  • Yu.G. Pashkevich A.A. Galkin Donetsk Phystech of the National Academy of Sciences of Ukraine, Donetsk 83114, Ukraine
  • P. Lemmens Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany
  • H. Berger Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
  • F. Bussy Institute of Mineralogy and Geochemistry, ANTHROPOLE, University of Lausanne, CH-1015 Lausanne, Switzerland
  • S.L. Gnatchenko B.I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.3455808

Ключові слова:

ferrimagnetism, magnetoelectric effect, symmetry analysis, Raman scattering, phonons, magnon modes.

Анотація

We report Raman scattering studies and magneto/structural symmetry analysis of the many sublattices ferrimagnet Cu2OSeO3 with a cubic symmetry and a linear magnetoelectric effect. There is no spectroscopic evidence for structural lattice distortions below TC = 60 K, which are expected due to magnetoelectric coupling. Using symmetry arguments we explain this observation by considering a special type of ferrimagnetic ground state which does not generate a spontaneous electric polarization. Interestingly, Raman scattering shows a strong increase of electric polarization of media through a dynamic magnetoelectric effect as a remarkable enhancement of the scattering intensity below TC. New lines of purely magnetic origin have been detected in the magnetically ordered state. A part of them are attributed as scattering on exchange magnons. Using this observation and further symmetry considerations we argue for strong Dzyaloshinskii–Moriya interaction existing in the Cu2OSeO3.

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Опубліковано

2010-05-25

Як цитувати

(1)
Gnezdilov, V.; Lamonova, K.; Pashkevich, Y.; Lemmens, P.; Berger, H.; Bussy, F.; Gnatchenko, S. Magnetoelectricity in the Ferrimagnetic Cu2OSeO3:symmetry Analysis and Raman Scattering Study. Fiz. Nizk. Temp. 2010, 36, 688-698.

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