Semiclassical spin liquid state of easy axis Kagome antiferromagnets

Details Semiclassical spin liquid state of easy axis Kagome antiferromagnets Semiclassical spin liquid state of easy axis Kagome antiferromagnets

2008-07-08

arxiv.org/abs/0807.1163v1

published version: Phys. Rev. Lett. {\bf 102}, 227001 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 eps figures

Scientific paper

Motivated by recent experiments on Nd-langasite, we consider the effect of strong easy axis single-ion anisotropy $D$ on $S > 3/2$ spins interacting with antiferromagnetic exchange $J$ on the Kagome lattice. When $T \ll DS^2$, the collinear low energy states selected by the anisotropy map on to configurations of the classical Kagome lattice Ising antiferromagnet. However, the low temperature limit is quite different from the cooperative Ising paramagnet that obtains classically for $T \ll JS^2$. We find that sub-leading ${\mathcal O}(J^3S/D^2)$ multi-spin interactions arising from the transverse quantum dynamics result in a crossover from an intermediate temperature classical cooperative Ising paramagnet to a semiclassical spin liquid with distinct short-ranged correlations for $T \ll J^3S/D^2$.

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