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On evaluation of transverse spin fluctuations in quantum magnets

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  • A. Singh

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

Suggested Citation

  • A. Singh, 1999. "On evaluation of transverse spin fluctuations in quantum magnets," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 11(1), pages 5-11, September.
    • Handle: RePEc:spr:eurphb:v:11:y:1999:i:1:p:5-11:10.1007/s100510050911
    DOI: 10.1007/s100510050911
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