Temperature Dependence of Resistivity of Sr₂CoMoO₆₋δ Films

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We investigate the temperature dependence of the resistivity and magnetoresistance of a polycrystalline Sr₂CoMoO₆₋δ film deposited on (100)-SrTiO₃ substrate prepared by the pulsed laser deposition method. X-ray diffraction, Raman and magnetoresistance results demonstrate clearly the coexistence of a ferromagnetic metallic and an antiferromagnetic (or paramagnetic) insulating domain. Percolative transition between these two phases as the temperature varies, which is believed to induce a metal-insulator transition at around TC, has been directly observed in our measurements of the temperature dependence of the sample resistivity. Thus we have provided new direct evidence that a phase separation scenario also exists in the ordered double-perovskite structure materials.