Gaussian Fluctuations of Molecular Field in Quasi-One-Dimensional Ising Model
Z. Onyszkiewicza and A. Wierzbickib
a Magnetism Theory Division, Faculty of Physics, A. Mickiewicz University, 61-614 PoznaƄ, Poland
b Department of Chemistry, University of South Alabama, Mobile, Alabama, 36 688 USA
Received: November 13, 1998
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Quasi-one-dimensional spin systems described by an Ising-like Hamiltonian with a strong space anisotropy (s=1/2) are investigated. Magnetic properties of this model are examined in the approximation including Gaussian fluctuations of molecular field. This paper reports an attempt at obtaining more accurate results for Gaussian fluctuation of molecular field by an exact formula for mean fluctuations of a spin.
DOI: 10.12693/APhysPolA.95.413
PACS numbers: 75.10.Hk, 75.70.Ak