Re-Entrant Quantum Phase Transitions in Antiferromagnetic Spin-1 Ladders
Shoji Yamamoto, Toru Sakai, Akihisa Koga
Abstract
In response to recent chemical attempts to construct higher-spin ladder materials from organic polyradicals, we study the ground-state properties of a wide class of antiferromagnetic spin-1 ladders. Employing various numerical tools, we reveal the rich phase diagram and correct a preceding nonlinear-sigma-model prediction. A variational analysis well interprets the phase competition with particular emphasis on the re-entrant phase boundary as a function of the rung interaction.
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