Abstract
The method of the double-time temperature spin Green functions is used to develop the theory of low-dimensional quantum Heisenberg ferromagnets and antiferromagnets with arbitrary spin. In Tyablikov approximation the correlation functions, the susceptibility of ferromagnets and the staggered susceptibility of antiferromagnets as well as magnetic field dependence of the magnetization for ferromagnets are found. The formulas derived describe ferromagnets and antiferromagnets at arbitrary temperatures and interpolate the regions of low and high temperature behavior. It is paramagnetic temperature that separates the regions of different analytical behavior of the system parameters. The influence of kinetic interaction to the Takahashi’s spin-wave theory with fixed number of bosons is discussed.
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© 1992 Springer-Verlag Berlin Heidelberg
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Yablonskii, D.A. (1992). Theoretical Approaches in Low-Dimensional Quantum Heisenberg Models. In: Davydov, A.S., Loktev, V.M. (eds) High-Tc Superconductivity. Research Reports in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77293-1_7
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DOI: https://doi.org/10.1007/978-3-642-77293-1_7
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