Ground State Phase Diagram of the Distorted S=1 Kagomé Heisenberg Antiferromagnets with Single-site Anisotropy

Details Ground State Phase Diagram of the Distorted S=1 Kagomé Heisenberg Antiferromagnets with Single-site Anisotropy Ground State Phase Diagram of the Distorted S=1 Kagomé Heisenberg Antiferromagnets with Single-site Anisotropy

2002-07-25

arxiv.org/abs/cond-mat/0207595v1

J. Phys. Soc. Jpn. 71, 3021-3023 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, 1 table

Scientific paper

10.1143/JPSJ.71.3021

The ground state phase transitions in the distorted S=1 kagome Heisenberg antiferromagnet (KHAF) with single-site anisotropy D are studied by the numerical exact diagonalization method. For strong easy plane anisotropy, the hexgonal singlet solid (HSS) ground state of the uniform KHAF is destroyed and large-D state is realized. The quantum phase transition between these two states is analogous to the Haldane-large-D transition in the S=1 antiferromagnetic Heisenberg chain. The combined effect of the sqrt(3) times sqrt(3) lattice distortion and single site anisotropy is also investigated. The ground state phase diagram expected from the numerical results is presented. The presence of this transition is consistent with the HSS picture of the ground state of the uniform S=1 KHAF and supports its validity.

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