Anisotropy effects in a mixed quantum-classical Heisenberg model in two dimensions
Abstract
We analyse a specific two dimensional mixed spin Heisenberg model with exchange anisotropy, by means of high temperature expansions and Monte Carlo simulations. The goal is to describe the magnetic properties of the compound (NBu4)2Mn2[Cu(opba)]3· 6DMSO· H2O which exhibits a ferromagnetic transition at Tc=15K. Extrapolating our analysis on the basis of renormalisation group arguments, we find that this transition may result from a very weak anisotropy effect.
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