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arXiv · 1006.3238

Incommensurate short-range order in the S=1 triangular antiferromagnet NiGa2S4

C. Stock·S. Jonas·C. Broholm·S. Nakatsuji·Y. Nambu·K. Onuma·Y. Maeno·J. -H. Chung
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Abstract

Neutron scattering is used to investigate spin correlations in ultra pure single crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weiss temperature of Theta_CW=-80(2) K, static (tau > 1 ns) short range (xi_ab=26(3) \AA) incommensurate order prevails for T>1.5 K. The incommensurate modulation Q_0=(0.155(3),0.155(3),0), Theta_CW, and the spin wave velocity (c=4400 m/s) can be accounted for by antiferromagnetic third-nearest neighbor interactions J_3=2.8(6) meV and ferromagnetic nearest neighbor coupling J_1=-0.35(9) J_3. Inter-plane correlations are limited to nearest neighbors and weakened by an in-plane field. These observations show that the short range ordered glassy phase that has been observed in a number of highly degenerate systems, can persist near the clean limit.

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C. Stock, S. Jonas, C. Broholm, S. Nakatsuji, Y. Nambu, K. Onuma, Y. Maeno, J. -H. Chung. 2010-06-16. Incommensurate short-range order in the S=1 triangular antiferromagnet NiGa2S4. https://doi.org/10.1103/physrevlett.105.037402

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