Effect of Fe doping in La1-xSrxMnO3

The effects of Fe doping on the magnetic, transport, and magnetoresistance properties are studied for La0.7Sr0.3Mn1-yFeyO3 (y = 0-0.18) and La1-xSrxMn0.88Fe0.12O3 (x = 0.1-0.50). For increasing y, a peak in the thermal dependence of the resistivity appears and develops at the temperature TPl lower than TC, while the another peak near TC becomes smaller and then disappears. At 78 K the La1-XSrXMn0.88Fe0.12O3 oxides are insulators for X<0.2 and x>0.5 and only the lower-temperature metal-insulator transition peak appears for 0.25更多