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High Field ESR in the Two-Dimensional Triangular Lattice Antiferromagnet NiGa2S4

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arxiv 0807.4438 v2 pith:U7AVOOBA submitted 2008-07-28 cond-mat.mtrl-sci cond-mat.str-el

High Field ESR in the Two-Dimensional Triangular Lattice Antiferromagnet NiGa2S4

H. Yamaguchi , S. Kimura , M. Hagiwara , Y. Nambu , S. Nakatsuji , Y. Maeno , K. Kindo This is my paper
classification cond-mat.mtrl-sci cond-mat.str-el
keywords dependencedynamicsfieldshighniga2s4resultsspinabsorption
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this Letter, we report the results of ESR measurements in high magnetic fields up to about 53 T on single crystals of NiGa2S4 to clarify the spin dynamics in more detail. We have found that the dynamics of Z2 vortices affects the temperature dependence of the ESR absorption linewidth and the frequency dependence of the ESR resonance fields at 1.3 K is well explained by a conventional spin wave theory. These results suggest an occurrence of Z2 vortex-induced topological transition.

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