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Thermally and electrically induced switching in manganese doped perovskites

Thermally and electrically induced switching between high and low-resistance states is observed in single crystals of LaGa1−xMnxO3 in a broad range of Mn ion concentrations. Changes in the electrical conductivity are quasi-permanent at room temperature but can be easily erased by heating up to Tc ∼ 300 °C, pointing to the role of phase transformation processes. To explain the experimental data, we propose a model which takes into account thermo-induced local phase transition with the oxidation of Mn ions. The results of the ab initio calculations of the electron energy structure in Jahn–Teller-distorted and non-distorted cells confirm the mechanism suggested.