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.
@article{arxiv.cond-mat/0105096,
title = {Magnetism of a tetrahedral cluster spin-chain},
author = {Wolfram Brenig and Klaus W. Becker},
journal= {arXiv preprint arXiv:cond-mat/0105096},
year = {2009}
}