Abstract
This study investigates the magnetic, electrical, and magnetoresistive properties of the oxygen-deficient compositions of La0.7Sr0.3CoO3-δ. Experimental results indicate that the La0.7Sr0.3CoO3-δ (0≦δ≦0.15) compositions are all ferromagnetic and exhibit a metal-insulator (M-I) transition. The magnetization decrease and resistivity increase depend on the oxygen deficiency. Our results further suggest that the oxygen nonstoichiometry facilitates the cooling of the TC and TP. At a low temperature, the magnetoresistance depends heavily on magnetization. A large MR effect is observed in a larger oxygen deficiency. Moreover, this study also discusses possible mechanisms.
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