Ordering and Criticality in Spin-1 Chains
- 31 October 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 61 (18) , 2133-2136
Abstract
The behavior of the antiferromagnetic, nearest-neighbor, spin-1 chain is studied in a space of interactions which includes exchange anisotropy, bond alternation, and biquadratic exchange. We find that bond alternation can stabilize Néel order; that with sufficient biquadratic coupling the ground state may be spontaneously dimerized and simultaneously critical; and that there is a line of multicritical points where the Néel-ordered phase touches the manifold of isotropic coupling. Predictions of Affleck and Haldane regarding the criticality and ordering in these models are tested.
Keywords
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