Journal of Physical Studies 8(2), 183–186 (2004) DOI: https://doi.org/10.30970/jps.08.183 LONGITUDINAL MAGNETIC FIELD EFFECT ON THERMODYNAMIC PROPERTIES OF THE XXZ-MODEL WITH EASY-AXIS TYPE MAGNETIC ANISOTROPY. THE TWO-PARTICLE CLUSTER APPROXIMATION R. R. Levitskii, O. R. Baran Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 1 Svientsitskii St., Lviv, UA-79011, Ukraine

Within cluster approximation the longitudinal magnetic field effect on thermodynamic characteristics of the ferromagnetic $XXZ$-model with the easy-axis type anisotropy was studied. Applicability region of the two-particle cluster approximation was established for different lattice types.

PACS number(s): 75.10.Jm

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