A Model of Single Molecule Magnet Behavior of the Cu~ⅡLTb~Ⅲ(hfac)_2_2 Cluster

摘要

We report a model for the explanation of the single molecule magnet behavior of the [Cu~ⅡLTb~Ⅲ(hfac)_2]_2 cluster. The model takes into account the crystal field acting on the Tb~Ⅲ -ion and the exchange interaction between the Tb and Cu ions. The energies of the low-lying levels are shown to increase with the decrease of the mean value of the z-projection of the total angular momentum of the cluster, thus forming a barrier for magnetization reversal that is in accordance with the experimental evidence.