We have investigated the volume collapse occurring in LaMnO3 unit cell using the anisotropic Potts mode modified by two types of anisotropic interactions which has been used to study the behavior of the orbital-ordering configurations with temperature. The bond lengths are related to the occupation of the orbits. We have shown that the collapse is due to the change of ... Read more

The Jahn-Teller distortive transition of LaMnO3 is described by a modified three-state Potts model. The interactions between the three possible orbits depends both on the orbits and their relative orientation on the lattice. Values of the two exchange parameters which are chosen to give the correct low temperature phase and the correct value for the transition temperature are shown to ... Read more