Series expansion analysis of a tetrahedral cluster spin chain

M. Arlego () and W. Brenig ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 53, issue 2, 193-198

Abstract: Using analytical series expansion by continuous unitary transformations we study the magnetic properties of a frustrated tetrahedral spin- $\frac{1}{2}$ chain. Starting from the limit of isolated tetrahedra we analyze the evolution of the ground state energy and the elementary triplet dispersion as a function of the inter-tetrahedral coupling. The quantum phase diagram is evaluated and is shown to incorporate a singlet product, a dimer, and a Haldane phase. Comparison of our results with those from several other techniques, such as density matrix renormalization group, exact diagonalization, bond-operator theory and other numerical series expansion are provided and convincing agreement is found. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 75.10.Jm Quantized spin models; 75.50.Ee Antiferromagnetics; 02.30.Mv Approximations and expansions (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00366-7

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