Eur. Phys. J. B 48, 19-27 (2005)
https://doi.org/10.1140/epjb/e2005-00367-0

Diluted spin conversion compounds behaviours in the atom-phonon coupling model: case of not too large dilution

Role of the Lennard-Jones potential?

Laboratoire LIRIS, Université de Versailles Saint-Quentin, 45 Avenue des États-Unis, 78 035 Versailles Cedex, France

Corresponding author: ^a jnasser@physique.uvsq.fr

Received: 4 April 2005
Revised: 12 July 2005
Published online: 9 December 2005

Abstract

We use an atom-phonon coupling model, introduced recently for spin-conversion phenomenon, in order to describe the behaviours of diluted spin conversion compounds. We keep the basic assumption of the model which is that the interaction between two molecules is harmonic and that the value of the elastic force constant of this interaction is reduced when one molecule becomes High-Spin. The main features of the experimental behaviours of diluted spin conversion compounds are qualitatively reproduced. This model can be founded on the Lennard-Jones potential between molecules.