Spin Gap in Two-Dimensional Heisenberg Model for CaV4O9
- 15 November 1995
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 64 (11) , 4105-4108
- https://doi.org/10.1143/jpsj.64.4105
Abstract
We investigate the mechanism of spin gap formation in a two-dimensional model relevant to Mott insulators such as CaV$_4$O$_9$. 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.Comment: 8 pages, 6 figures available upon request (RevtexKeywords
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