The spin gap of CaV4O9 revisited

Details The spin gap of CaV4O9 revisited The spin gap of CaV4O9 revisited

1998-12-15

arxiv.org/abs/cond-mat/9812248v1

Physica B 259-261 (1999) 967-968

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages with 3 figures

Scientific paper

10.1016/S0921-4526(98)00726-1

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.

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