Ground state properties of the ferrimagnetic one and two-dimensional Heisenberg model: Influence of dimerization and competitive interactions

R.S. Lapa () and A.S.T. Pires

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 9, 1-10

Abstract: We use the Schwinger boson mean field theory to study the effect of frustration and dimerization in the quantum ferrimagnetic model in one and two-dimensions. We calculate the spin reduction, the gap of the antiferromagnetic branch, and the spin fluctuation at T = 0 K. At finite temperature, the long-range order is destroyed because of the disappearance of the Bose condensation. The free energy, the magnetic susceptibility and the spin correlations at T = 0 K, are calculated. The effects of frustration and dimerization are discussed. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2013-40001-0

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