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Influence of the lattice geometry on the thermodynamical properties of two-dimensional spin systems | | B. Mombelli
; O. Kahn
; J. Leandri
; Y. Leroyer
; S. Mechkov
; Y. Meurdesoif
; | | Date: |
18 Oct 1997 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Affiliation: | Laboratoire des Sciences Moleculaires, Institut de Chimie de la Matiere Condensee de Bordeaux, CNRS, France, Centre de Physique Theorique et de Modelisation de Bordeaux, CNRS, France | | Abstract: | Various types of mixed spin two-dimensional Heisenberg networks are investigated by means of Monte Carlo simulations. This study aims at interpreting quantitatively the thermodynamical properties of two-dimensional molecule-based magnets recently synthesized. The proposed model requires that: (i) one of the two magnetic centers has a spin large enough to be treated as a classical spin; (ii) the zero field Hamiltonian is isotropic; (iii) the quantum spins have only classical spins as neighbours. The quantum Hamiltonian is then replaced by a classical one with effective ferromagnetic interactions. The temperature dependence of both the specific heat and magnetic susceptibility are calculated. The effect of the lattice geometry is analysed. | | Source: | arXiv, cond-mat/9710191 | | Services: | Forum | Review | PDF | Favorites | |
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