On evaluation of transverse spin fluctuations in quantum magnets

A. Singh ()

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 1, 5-11

Abstract: A numerical method is described for evaluating transverse spin correlations in the random phase approximation. Quantum spin-fluctuation corrections to sublattice magnetization are evaluated for the antiferromagnetic ground state of the half-filled Hubbard model in two and three dimensions in the whole U/t range. Extension to the case of defects in the AF is also discussed for spin vacancies and low-U impurities. In the U/t → ∞ limit, the vacancy-induced enhancement in the spin fluctuation correction is obtained for the spin-vacancy problem in two dimensions, for vacancy concentration up to the percolation threshold. For low-U impurities, the overall spin fluctuation correction is found to be strongly suppressed, although surprisingly spin fluctuations are locally enhanced at the low-U sites. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Keywords: PACS. 75.10.Jm Quantized spin models; 75.10.Lp Band and itinerant models; 75.30.Ds Spin waves (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/s100510050911

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