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arXiv · 0706.2362

Magnetization plateaus and sublattice ordering in easy axis Kagome lattice antiferromagnets

Arnab Sen·Kedar Damle·Ashvin Vishwanath
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Abstract

We study kagome lattice antiferromagnets where the effects of easy axis single-ion anisotropy ($D$) dominates over the Heisenberg exchange $J$. For $S \ge 3/2$, virtual quantum fluctuations help lift the extensive classical degeneracy. We demonstrate the presence of a one-third magnetization plateau for a broad range of magnetic fields $J^3/D^2 \lesssim B \lesssim JS$ along the easy axis. The fully equilibriated system at low temperature on this plateau develops an unusual {\em nematic} order that breaks sublattice rotation symmetry but not translation symmetry--however, extremely slow dynamics associated with this ordering is expected to lead to glassy freezing of the system on intermediate time-scales.

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Arnab Sen, Kedar Damle, Ashvin Vishwanath. 2008-03-29. Magnetization plateaus and sublattice ordering in easy axis Kagome lattice antiferromagnets. https://doi.org/10.1103/physrevlett.100.097202

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