Modified self-consistent harmonic approximation and its application to two-dimensional easy-axis quantum ferromagnets

Details Modified self-consistent harmonic approximation and its application to two-dimensional easy-axis quantum ferromagnets Modified self-consistent harmonic approximation and its application to two-dimensional easy-axis quantum ferromagnets

2003-03-29

arxiv.org/abs/cond-mat/0303619v2

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 2 figures Some mistakes have been corrected

Scientific paper

In the paper we describe the modification of self-consistent harmonic
approximation for quantum S=1 systems. This method has a number of advantages
in comparison with usual SCHA. We apply the method to two-dimensional
ferromagnets with easy-axis exchange or single-site anisotropy. The results are
in good agreement with Monte-Carlo simulations and pure-quantum SCHA.

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