Spin nematics and magnetization plateau transition in anisotropic Kagome magnets

Details Spin nematics and magnetization plateau transition in anisotropic Kagome magnets Spin nematics and magnetization plateau transition in anisotropic Kagome magnets

2006-02-28

arxiv.org/abs/cond-mat/0602671v1

Phys. Rev. Lett. 97, 067202 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, two-column format, three .eps figures

Scientific paper

10.1103/PhysRevLett.97.067202

We study S=1 kagome antiferromagnets with isotropic Heisenberg exchange $J$ and strong easy axis single-ion anisotropy $D$. For $D \gg J$, the low-energy physics can be described by an effective $S=1/2$ $XXZ$ model with antiferromagnetic $J_z \sim J$ and ferromagnetic $J_\perp \sim J^2/D$. Exploiting this connection, we argue that non-trivial ordering into a "spin-nematic" occurs whenever $D$ dominates over $J$, and discuss its experimental signatures. We also study a magnetic field induced transition to a magnetization plateau state at magnetization 1/3 which breaks lattice translation symmetry due to ordering of the $S^z$ and occupies a lobe in the $B/J_z$-$J_z/J_\perp$ phase diagram.

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