The spin gap of CaV4O9 revisited
arXiv:cond-mat/9812248 · doi:10.1016/S0921-4526(98)00726-1
Abstract
The large-plaquette scenario of the spin gap in CaV4O9 is investigated on the basis of extensive exact diagonalizations. We confirm the existence of a large-plaquette phase in a wide range of parameters, and we show that the most recent neutron scattering data actually require an intra-plaquette second neighbor exchange integral much larger than the inter-plaquette one, thus justifying the perturbative calculation used in the interpretation of the neutron scattering experiments.
2 pages with 3 figures