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Title: Polarization analysis of magnetic excitation in multiferroic Ba 2 CoGe 2 O 7

Magnetic excitations in the multiferroic Ba 2CoGe 2O 7 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 Ba 2CoGe 2O 7. In conclusion, the longitudinal fluctuation takes on a main role in the electromagnon mode.
Authors:
 [1] ;  [2] ;  [3] ; ORCiD logo [4] ;  [5] ;  [5] ;  [6] ;  [7]
  1. 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
  2. National Cheng Kung Univ., Tainan City (Taiwan). Dept. of Physics
  3. Shizuoka Univ., Shizuoka (Japan). Dept. of Physics
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  5. Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
  6. 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
  7. Univ. of Tokyo (Japan). Neutron Science Lab., Inst. for Solid State Physics
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1468012
Alternate Identifier(s):
OSTI ID: 1457815

Soda, Minoru, Chang, Lieh-Jeng, Matsumoto, Masashige, Garlea, Vasile Ovidiu, Roessli, Bertrand, White, Jonathan S., Kawano-Furukawa, Hazuki, and Masuda, Takatsugu. Polarization analysis of magnetic excitation in multiferroic Ba2CoGe2O7. United States: N. p., Web. doi:10.1103/PhysRevB.97.214437.
Soda, Minoru, Chang, Lieh-Jeng, Matsumoto, Masashige, Garlea, Vasile Ovidiu, Roessli, Bertrand, White, Jonathan S., Kawano-Furukawa, Hazuki, & Masuda, Takatsugu. Polarization analysis of magnetic excitation in multiferroic Ba2CoGe2O7. United States. doi:10.1103/PhysRevB.97.214437.
Soda, Minoru, Chang, Lieh-Jeng, Matsumoto, Masashige, Garlea, Vasile Ovidiu, Roessli, Bertrand, White, Jonathan S., Kawano-Furukawa, Hazuki, and Masuda, Takatsugu. 2018. "Polarization analysis of magnetic excitation in multiferroic Ba2CoGe2O7". United States. doi:10.1103/PhysRevB.97.214437.
@article{osti_1468012,
title = {Polarization analysis of magnetic excitation in multiferroic Ba2CoGe2O7},
author = {Soda, Minoru and Chang, Lieh-Jeng and Matsumoto, Masashige and Garlea, Vasile Ovidiu and Roessli, Bertrand and White, Jonathan S. and Kawano-Furukawa, Hazuki and Masuda, Takatsugu},
abstractNote = {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.},
doi = {10.1103/PhysRevB.97.214437},
journal = {Physical Review B},
number = 21,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}