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Ground states with cluster structures in a frustrated Heisenberg chain | K. Takano
; K. Kubo
; H. Sakamoto
; | Date: |
8 Jul 1996 | Subject: | cond-mat | Abstract: | We examine the ground state of a Heisenberg model with arbitrary spin S on a one-dimensional lattice composed of diamond-shaped units. A unit includes two types of antiferromagnetic exchange interactions which frustrate each other. The system undergoes phase changes when the ratio $lambda$ between the exchange parameters varies. In some phases, strong frustration leads to larger local structures or clusters of spins than a dimer. We prove for arbitrary S that there exists a phase with four-spin cluster states, which was previously found numerically for a special value of $lambda$ in the S=1/2 case. For S=1/2 we show that there are three ground state phases and determine their boundaries. | Source: | arXiv, cond-mat/9607052 | Services: | Forum | Review | PDF | Favorites |
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