Speaker
Description
Frustrated triangular lattice antiferromagnets show a variety of exotic properties. Experimental observations in NiGa2S4 S=1 system [1] suggest i) presence of quadrupolar correlations [2] in addition to the moderate nearest-neighbor (J1) and strong third-neartest-neighbor (J3) Heisenberg interactions and ii) a topological transition driven by the Z2-vortex binding-unbinding [3].
We study the sister compound FeGa2S4 S=2 [4] by means of neutron scattering. Our aim is to establish the dominant terms in the spin Hamiltonian and to exploit the possibility of multi-k formation.
[1] C. Stock et al. PRL 105,037402(2010)
[2] E.M. Stoudenmire et al. PRB 79,214436(2009)
[3] T. OPkubo, H. Kawamura J.Phys.Soc.Jpn 79,084706(2010)
[4] S. Nakatsuji et al. PRL 99,157203(2007)
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