Polarization analysis of magnetic excitation in multiferroic Ba2CoGe2O7

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

doi:10.1103/PhysRevB.97.214437

Title: Polarization analysis of magnetic excitation in multiferroic ${Ba}_{2} {CoGe}_{2} O_{7}$

Journal Article · Fri Jun 29 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.214437· OSTI ID:1468012

Soda, Minoru ^[1]; Chang, Lieh-Jeng ^[2]; Matsumoto, Masashige ^[3];

^[4]; Roessli, Bertrand ^[5]; White, Jonathan S. ^[5]; Kawano-Furukawa, Hazuki ^[6]; Masuda, Takatsugu ^[7]

Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Emergent Matter Science; Univ. of Tokyo (Japan). Neutron Science Lab., Inst. for Solid State Physics
National Cheng Kung Univ., Tainan City (Taiwan). Dept. of Physics
Shizuoka Univ., Shizuoka (Japan). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Emergent Matter Science; G.S.H.S. Ochanomizu Univ., Tokyo (Japan). Dept. of Physics, Advanced Sciences
Univ. of Tokyo (Japan). Neutron Science Lab., Inst. for Solid State Physics

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. In conclusion, the longitudinal fluctuation takes on a main role in the electromagnon mode.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1468012

Alternate ID(s):: OSTI ID: 1457815

Journal Information:: Physical Review B, Vol. 97, Issue 21; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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