Abstract
We report structural and electrical studies of Pr0.6Sr0.4Mn1-xBixO3 (x=0,0.1 and 0.2) manganites. In manganitesMn ions play a crucial role in shaping the physical properties. Possible reasons for the observed structural, changes of resistivity behavior with Bi doping are discussed. Replacing trivalent Bi ion with Mn ion provides us a system to understand weakened double-exchange (DE) interaction (Mn3+-O-Mn4+). X-ray powder diffraction showed that all synthesized samples are single phase and crystallize in the orthorhombic symmetry with Pnmaspace group. The unit cell volume decreases with increasing Bi content. The value of metal-insulator (M-I) transition temperature (TMI) decreases and resistivity increases as doping level x increases. The drop in resistivityatTMI results from the reduced contribution of magnetic scattering. Ferromagnetic metallic resistivity is observed well below the metal-insulator transition temperature. Above the metal insulator transition temperature the electrical conductivity is dominated by small polaron hopping (SPH) model.
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