Polarization analysis of magnetic excitation in multiferroic Ba2 CoGe2 O7

Minoru Soda, Lieh Jeng Chang, Masashige Matsumoto, V. Ovidiu Garlea, Bertrand Roessli, Jonathan S. White, Hazuki Kawano-Furukawa, Takatsugu Masuda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Magnetic excitations in the multiferroic Ba2CoGe2O7 are measured by combination of unpolarized and polarized neutron-scattering techniques. The unpolarized neutron spectrum reveals an anisotropic Q dependence of the intensity of the electromagnon mode at 4 meV. The analysis of the polarized neutron spectra identifies the directions of the magnetic fluctuations of the observed modes. The determined modes are consistent with the calculation by the extended spin-wave theory. A couple of transverse modes and a single longitudinal mode are involved in the magnetic excitation of Ba2CoGe2O7. The longitudinal fluctuation takes on a main role in the electromagnon mode.

Original languageEnglish
Article number214437
JournalPhysical Review B
Volume97
Issue number21
DOIs
Publication statusPublished - 2018 Jun 29

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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