We study the planar antiferromagnetic Heisenberg model on a decorated hexagonal lattice, involving both classical spins (occupying the vertices) and quantum spins (occupying the middle of the links). This study is motivated by the description of a recently synthesized molecular magnetic compound. First, we trace out the spin 1/2 degrees of freedom to obtain a fully classical model with an effective ferromagnetic interaction. Then, using high temperature expansions and Monte Carlo simulations, we analyse its thermal and magnetic properties. We show that it provides a good quantitative description of the magnetic susceptibility of the molecular magnet in its paramagnetic phase.
@article{arxiv.cond-mat/9603102,
title = {Thermodynamics of a mixed quantum-classical Heisenberg model in two dimensions},
author = {J. Leandri and Y. Leroyer and S. V. Meshkov and Y. Meurdesoif and O. Kahn and B. Mombelli and D. Price},
journal= {arXiv preprint arXiv:cond-mat/9603102},
year = {2009}
}
Comments
Revtex, 6 pages, 4 included postscript figures, fig.1 upon request to [email protected] . To appear in J. of Physic C (condensed matter)