Triangular and kagome antiferromagnets with a strong easy-axis anisotropy

Sen, Arnab ; Wang, Fa ; Damle, Kedar ; Moessner, R. (2009) Triangular and kagome antiferromagnets with a strong easy-axis anisotropy Physical Review Letters, 102 (22). Article ID 227001. ISSN 0031-9007

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We consider S>3/2 kagome and triangular lattice magnets with strong easy-axis single-ion anisotropy D and antiferromagnetic exchange J. When D≫J, the low energy states selected by the anisotropy map onto configurations of the corresponding classical Ising antiferromagnet. Subleading O(J3S/D2) multispin interaction arising from the transverse quantum dynamics makes the low-temperature behavior very different from the well-known classical case: The kagome magnet goes into a semiclassical spin-liquid state with distinctive and unusual short-range correlations below a crossover temperature T≈0.08J3S/D2, while the triangular magnet undergoes a first-order transition at Tc≈0.1J3S/D2 to an orientationally ordered collinear state that gives rise to a novel zero-magnetization plateau for small magnetic fields along the easy axis. Possible experimental implications are also discussed.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:103098
Deposited On:09 Mar 2018 11:29
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