The Heisenberg model on the 1/5-depleted square lattice and the CaV4O9 compound

L. O. MANUEL; MICHELETTI, M. I.; TRUMPER, ADOLFO E.; CECCATTO, H. A.

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Physical Society

Lugar: New York, Estados Unidos de America; Año: 1998 vol. 58 p. 8490 - 8494

0163-1829

We investigate the ground-state structure of the Heisenberg model on the 1/5-depleted square lattice for arbitrary values of the first- and second-neighbor exchange couplings. By using a mean-field Schwinger-boson approach we present a unified description of the rich ground-state phase diagram, which includes the plaquette and dimer resonant-valence-bond phases, long- and short-range Néel orders, an incommensurate phase, and other magnetic orders with complex magnetic unit cells. We also discuss some implications of our results for the experimental realization of this model in the CaV4O9 compound.