Optical Investigation of the Magnetic Excitations in Two-Dimensional Triangular Lattice Antiferromagnets

Norimichi Kojima; K\={o}zo Ito; Iwao Mogi; Masayasu Takeda; Giyuu Kido; Yasuaki Nakagawa; Masamichi Sakai; Noritaka Kuroda; Y\={u}ichir\={o} Nishina

doi:10.1143/JPSJ.62.4137

Norimichi Kojima, K\={o}zo Ito, Iwao Mogi, Masayasu Takeda, Giyuu Kido, Yasuaki Nakagawa, Masamichi Sakai, Noritaka Kuroda, Y\={u}ichir\={o} Nishina

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Norimichi Kojima
Department of Chemistry, Faculty of Science, Kyoto University
K\={o}zo Ito
Department of Chemistry, Faculty of Science, Kyoto University
Iwao Mogi
Institute for Materials Research, Tohoku University
Masayasu Takeda
Institute for Materials Research, Tohoku University
Giyuu Kido
Institute for Materials Research, Tohoku University
Yasuaki Nakagawa
Institute for Materials Research, Tohoku University
Masamichi Sakai
Institute for Materials Research, Tohoku University
Noritaka Kuroda
Institute for Materials Research, Tohoku University
Y\={u}ichir\={o} Nishina
Institute for Materials Research, Tohoku University

Keywords: magnon sideband, magnon Raman scattering, spin frustration, two-dimensional triangular lattice, Z₂-vortex, VX₂ (X=Cl, Br and I), LiCrO₂

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1993 Volume 62 Issue 11 Pages 4137-4145

DOI https://doi.org/10.1143/JPSJ.62.4137

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Abstract

We have investigated exciton-magnon absorption spectra in VX₂ (X=Cl, Br and I) and LiCrO₂ known as two-dimensional Heisenberg triangular lattice antiferromagnets (2DH TAL–AF) in order to study the effect of the peculiar spin frustration on the magnetic elementary excitations. In VX₂ (X=Cl and Br) and LiCrO₂, the temperature dependence of the line width of the exciton-magnon absorption resembles closely that of the density of the characteristic point defects known as Z₂-vortex in 2DH TAL–AF. Thus the line width of the exciton magnon absorption in 2DH TAL–AF exhibits Z₂-vortex induced broadening. We also reported the magnetic Raman scattering in VCl₂ and VI₂.

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