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Plaquette ground state in the two-dimensional SU(4) spin-orbital model

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Abstract:

In order to understand the properties of Mott insulators with strong ground state orbital fluctuations, we study the zero temperature properties of the SU(4) spin-orbital model on a square lattice. Exact diagonalizations of finite clusters suggest that the ground state is disordered with a singlet-multiplet gap and possibly low-lying SU(4) singlets in the gap. An interpretation in terms of plaquette SU(4) singlets is proposed. The implications for LiNiO2 are discussed.

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Authors and Affiliations

  1. Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse Cedex, France, , , , , , FR

    M. van den Bossche

  2. Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA, , , , , , US

    F.-C. Zhang

  3. Institut de Physique Théorique, Université de Lausanne, 1015 Lausanne, Switzerland, , , , , , CH

    F. Mila

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  1. M. van den Bossche
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  2. F.-C. Zhang
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  3. F. Mila
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Received 6 July 2000

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van den Bossche, M., Zhang, FC. & Mila, F. Plaquette ground state in the two-dimensional SU(4) spin-orbital model. Eur. Phys. J. B 17, 367–370 (2000). https://doi.org/10.1007/PL00011085

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  • DOI: https://doi.org/10.1007/PL00011085

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