Abstract
We have investigated exciton-magnon absorption spectra in VX 2 (X=Cl, Br and I) and LiCrO 2 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 VX 2 (X=Cl and Br) and LiCrO 2 , 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 Z 2 -vortex in 2DH TAL-AF. Thus the line width of the exciton magnon absorption in 2DH TAL-AF exhibits Z 2 -vortex induced broadening. We also reported the magnetic Raman scattering in VCl 2 and VI 2 .
Published Version
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