Ising-like model for the two step spin-crossover of binuclear molecules

Azzedine Bousseksou (1, 2) , F. Varret (2) , J. Nasser (2)

1 LCC - Laboratoire de chimie de coordination
2 UPMC - Université Pierre et Marie Curie - Paris 6

We present a two-sublattice Ising-type model, involving one intramolecular interaction treated rigorously and intermolecular interactions treated in the mean-field approach, in order to describe the two-step transition exhibited by a bi-nuclear spin-crossover complex. Spontaneous symmetry breakings can be obtained according to the relative values of the interactions parameters. The phase diagram is given and the experimental data of [ Fe(bt) (NCS)2] 2bpym are treated in the present model.


Domains: Physics [physics]; Physics archives

Azzedine Bousseksou, F. Varret, J. Nasser. Ising-like model for the two step spin-crossover of binuclear molecules. Journal de Physique I, 1993, 3 (6), pp.1463-1473. ⟨10.1051/jp1:1993191⟩. ⟨jpa-00246806⟩