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Plaquette resonating-valence-bond ground state of CaV4O9

  • Magnetism (Theory)
  • Published:
Czechoslovak Journal of Physics Aims and scope

Abstract

A theoretical model is presented to explain the spin gap observed for CaV4O9. The lattice structure is the regularly 1/5-depleted square lattice, where a plaquette formed byJ p is connected to the neighboring four plaquettes byJ d . BothJ p andJ p are antiferromagnetic. At isotropic coupling (J p =J d ) the ground state shows the Néel ordering, but is close vicinity of the quantum critical point to the plaquette resonating-valence-bond (PRVB) state. We show that a small frustrating next-nearest-neighbor interaction can drive the system into the PRVB state and thus explain a large spin gap compatible with experiments.

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References

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Authors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, 7-22-1 Roppongi, Minato-ku, 106, Tokyo, Japan

    H. Kontani, M. Troyer & K. Ueda

  2. Theoretische Physik, ETHZ Hënggerberg, Zürich, Switzerland

    M. Sigrist

  3. Department of Physics, Massachussetts Institute of Technology, 02139, Cambridge, Massachussetts

    P. A. Lee

Authors
  1. H. Kontani
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  2. M. Troyer
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  3. K. Ueda
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  4. M. Sigrist
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  5. P. A. Lee
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Kontani, H., Troyer, M., Ueda, K. et al. Plaquette resonating-valence-bond ground state of CaV4O9 . Czech J Phys 46 (Suppl 4), 1903–1904 (1996). https://doi.org/10.1007/BF02570943

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  • DOI: https://doi.org/10.1007/BF02570943

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