Magnetism of a tetrahedral cluster spin-chain

Details Magnetism of a tetrahedral cluster spin-chain Magnetism of a tetrahedral cluster spin-chain

2001-05-04

arxiv.org/abs/cond-mat/0105096v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.64.214413

We discuss the magnetic properties of a dimerized and completely frustrated tetrahedral spin-1/2 chain. Using a combination of exact diagonalization and bond-operator theory the quantum phase diagram is shown to incorporate a singlet-product, a dimer, and a Haldane phase. In addition we consider one-, and two-triplet excitations in the dimer phase and evaluate the magnetic Raman cross section which is found to be strongly renormalized by the presence of a two-triplet bound state. The link to a novel tellurate materials is clarified.

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