The antiferromagnetic spin 1/2 chain with competing dimers and plaquettes: Numerical versus exact results

Abstract

We examine the ground state and the excitations of an one-dimensional Heisenberg spin 1/2 antiferromagnet with alternating dimers and four-spin plaquettes (dimer-plaquette chain). The properties of the system depend on the competing dimer and plaquette bonds. Several exact, exact-numerical and perturbational results are presented. We find that the system is gapped for all parameter values. For the latter one we find an effective S=1 Haldane like behaviour in the limit of dominating dimer bonds. The model considered is related to the recently found 1/5-depleted square-lattice Heisenberg system $Ca{V}_4{O}_9$.

12 pages, LaTeX, 9 eps figures, to appear in J.o.Phys.: Cond. Mat

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