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arXiv:1404.6706 · Physics Letters A

Haldane-like antiferromagnetic spin chain in the large anisotropy limit

S. A. Owerre, Manu B. Paranjape

Published Aug 1, 2014• 7 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2014.08.029

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We analytically study the boundary between the Haldane phase and the large- D (LD) phase of a ferromagnetic-antiferromagnetic alternating Heisenberg chain with on-site easy-plane anisotropy. We transform this model into a generalized alternating antiferromagnetic Heisenberg model with anisotropy. In the transformed model, the competition between the transverse and longitudinal alternations results in the Haldane-LD transition. Our Haldane-LD boundary calculated through the bosonization method agrees very well with that of Hida [Phys. Rev. B 46 (1992) 8268], determined by the numerical method.