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

doi:10.1103/PhysRevB.97.214437

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

10 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 language	English
Article number	214437
Journal	Physical Review B
Volume	97
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.97.214437
Publication status	Published - 2018 Jun 29

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.97.214437

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title = "Polarization analysis of magnetic excitation in multiferroic Ba2 CoGe2 O7",

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.",

author = "Minoru Soda and Chang, \{Lieh Jeng\} and Masashige Matsumoto and Garlea, \{V. Ovidiu\} and Bertrand Roessli and White, \{Jonathan S.\} and Hazuki Kawano-Furukawa and Takatsugu Masuda",

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doi = "10.1103/PhysRevB.97.214437",

language = "English",

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T1 - Polarization analysis of magnetic excitation in multiferroic Ba2 CoGe2 O7

AU - Soda, Minoru

AU - Chang, Lieh Jeng

AU - Matsumoto, Masashige

AU - Garlea, V. Ovidiu

AU - Roessli, Bertrand

AU - White, Jonathan S.

AU - Kawano-Furukawa, Hazuki

AU - Masuda, Takatsugu

PY - 2018/6/29

Y1 - 2018/6/29

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.97.214437

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SN - 2469-9950

VL - 97

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JF - Physical Review B

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ER -

Polarization analysis of magnetic excitation in multiferroic Ba2 CoGe2 O7

Abstract

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