Spin Gap in Two-Dimensional Heisenberg Model for CaV4O9

Nobuyuki Katoh, Masatoshi Imada

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)


We investigate the mechanism of spin gap formation in a two-dimensional model relevant to Mott insulators such as CaV4O9. From the perturbation expansion and quantum Monte Carlo calculations, the origin of the spin gap is ascribed to the four-site plaquette singlet in contrast to the dimer gap established in the generalized dimerized Heisenberg model.

Original languageEnglish
Pages (from-to)4105-4108
Number of pages4
Journaljournal of the physical society of japan
Issue number11
Publication statusPublished - 1995 Nov
Externally publishedYes


  • CaVO
  • four-site plaquette singlet
  • spin gap

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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