Abstract:
We use the vertex state model approach to construct optimum ground states for a large class of quantum spin-2 antiferromagnets on the square lattice. Optimum ground states are exact ground states of the model which minimize all local interaction operators. The ground state contains two continuous parameters and exhibits a second order phase transition from a disordered phase with exponentially decaying correlation functions to a Néel ordered phase. The behaviour is very similar to that of the corresponding ground state of a quantum spin-3/2 model on the hexagonal lattice, which has been investigated in an earlier paper.
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Received 8 April 1999
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Niggemann, H., Klümper, A. & Zittartz, J. Ground state phase diagram of a spin-2 antiferromagnet on the square lattice. Eur. Phys. J. B 13, 15–19 (2000). https://doi.org/10.1007/s100510050004
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DOI: https://doi.org/10.1007/s100510050004