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

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

2008-07-28

arxiv.org/abs/0807.4438v2

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.78.180404

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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