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Competition between plaquette and dimer phases in Heisenberg chains

N. B. Ivanov, J. Richter

cond-matarXiv:cond-mat/9705162

Abstract

We consider a class of one-dimensional Heisenberg spin models (plaquette chains) related to the recently found 1/5-depleted square-lattice Heisenberg system CaV4O9. A number of exact and exact-numerical results concerning the properties of the competing dimer and resonating plaquette phases are presented.

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