Damle, Kedar and Senthil, T (2006) Spin Nematics and Magnetization Plateau Transition in Anisotropic Kagome Magnets. In: Physical Review Letters, 97 (6). 067202-1.
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We study S =1 kagome antiferromagnets with an isotropic Heisenberg exchange J and strong easyaxis 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 $J_\bot \sim J^2/D$. Exploiting this connection, we argue that nontrivial 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 $B/J_z-J_z/J_\bot$ phase diagram.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Physical Society|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||11 Oct 2006|
|Last Modified:||19 Sep 2010 04:31|
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