Meta-Plaquette Expansion for the Triplet Excitation Spectrum in CaV$_4$O$_9$

Details Meta-Plaquette Expansion for the Triplet Excitation Spectrum in CaV$_4$O$_9$ Meta-Plaquette Expansion for the Triplet Excitation Spectrum in CaV$_4$O$_9$

1998-07-17

arxiv.org/abs/cond-mat/9807249v1

Physical Review B58, 14147(1998).

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevB.58.14147

We study antiferromagnetic, $S=1/2$ Heisenberg models with nearest and second neighbor interactions on the one-fifth depleted square lattice which describes the spin degrees of freedom in the spin-gap system CaV$_4$O$_9$. The meta-plaquette expansion for the triplet excitation spectrum is extended to fifth order, and the results are compared with experimental data on CaV$_4$O$_9$. We attempt to locate the phase boundary between magnetically ordered and gapped phases.

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