Abstract
In the present paper, we study the effect of element substitution for quarter-filled nanoclusters of perovskite manganite by introducing Jahn-Teller type of perturbation interaction to the double-exchange Hamiltonian. Using the unrestricted real-space Hartree-Fock approximation method we find that, the Jahn-Teller electron-phonon interaction plays the central role in producing the phase transition from ferromagnetic phase to CE type antiferromagnetic phase. Not only the Jahn-Teller interaction benefits antiferromagnetic correlation, it also increases the charge density order parameter. These theoretical results provide a guidance to predict the properties and modify the composition of particles of perovskite manganite under nano-scale.
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