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Spin Nematics and Magnetization Plateau Transition in Anisotropic Kagome Magnets

2006; American Physical Society; Volume: 97; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.97.067202

1092-0145

Kedar Damle, T. Senthil,

Quantum, superfluid, helium dynamics

We study S=1 kagome antiferromagnets with an isotropic Heisenberg exchange J and strong easy-axis single-ion anisotropy D. For D>>J, the low-energy physics can be described by an effective S=1/2 XXZ model with antiferromagnetic Jz approximately J and ferromagnetic J perpendicular approximately J2/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 Sz and occupies a lobe in the B/Jz-Jz/J perpendicular phase diagram.