Abstract
Intergrowth perovskite type complex oxides of composition La1.2Sr1.8MnCrO7 and La1.5Sr1.5MnCrO7 have been synthesized by ceramic method. Rietveld profile analysis shows that the phases crystallize with tetragonal unit cell in the space group I4/mmm. Both the phases behave as insulators in the high temperature region and the linearity of log ρ versus T−1/4 plot in the temperature range 150–300 K shows that the electronic conduction occurs by a 3D variable range hopping mechanism. The phases show insulator-metal transition at low temperature which could be due to the mixed valence state of Mn3+/Mn4+ by double exchange mechanism. The ferromagnetic interactions observed for the samples arises from double exchange interaction between Mn3+ and Mn4+ and Cr3+ and Mn3+ ions.
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