Anisotropy effects in a mixed quantum-classical Heisenberg model in two dimensions

Details Anisotropy effects in a mixed quantum-classical Heisenberg model in two dimensions Anisotropy effects in a mixed quantum-classical Heisenberg model in two dimensions

1997-06-30

arxiv.org/abs/cond-mat/9706298v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 10 Postscript figures

Scientific paper

10.1088/0953-8984/10/9/012

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 (NBu_{4})_{2}Mn_{2}[Cu(opba)]_{3}\cdot 6DMSO\cdot H_{2}O which exhibits a ferromagnetic transition at $T_{c}=15K$. 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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