Ground-state long-range order in quasi-one-dimensional Heisenberg quantum antiferromagnets: high-order coupled-cluster calculations

R. Zinke (), J. Schulenburg and J. Richter

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 61, issue 2, 147-152

Abstract: We investigate the ground-state magnetic long-range order of quasi-one-dimensional quantum Heisenberg antiferromagnets for spin quantum numbers s=1/2 and s=1. We use the coupled cluster method to calculate the sublattice magnetization and its dependence on the inter-chain coupling J ⊥ . We find that for the unfrustrated spin-1/2 system, an infinitesimal inter-chain coupling is sufficient to stabilize magnetic long-range order, in agreement with results obtained by other methods. For s=1, we find that a finite inter-chain coupling is necessary to stabilize magnetic long-range order. Furthermore, we consider a quasi one-dimensional spin-1/2 system, where a frustrating next-nearest neighbor in-chain coupling is included. We find that for stronger frustration as well, a finite inter-chain coupling is necessary to have magnetic long-range order in the ground state, and that the strength of the inter-chain coupling necessary to establish magnetic long-range order is related to the size of the spin gap of the isolated chain. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 75.10.Jm Quantized spin models; 75.10.Pq Spin chain models; 75.50.Ee Antiferromagnetics (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00055-7

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