Physics – Condensed Matter
Scientific paper
1998-02-13
J.Phys.: Cond. Mat. 10 (1998) 3635-3649
Physics
Condensed Matter
12 pages, LaTeX, 9 eps figures, to appear in J.o.Phys.: Cond. Mat
Scientific paper
10.1088/0953-8984/10/16/015
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 $CaV_4O_9$.
Ivanov N. B.
Richter Jadwiga
Schulenburg J/"org
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