Incommensurate short-range order in the S=1 triangular antiferromagnet NiGa2S4
| Autor: | Stock, C., Jonas, S., Broholm, C., Nakatsuji, S., Nambu, Y., Onuma, K., Maeno, Y., Chung, J. -H. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 105, 037402 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.105.037402 |
| Popis: | 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. Comment: 4 pages, 4 figures, to be published in Physical Review Letters |
| Databáze: | arXiv |
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