Abstract
It is known that the electric and magnetic properties of typical double-exchange materials La1−xSrxMnO3−y (LSMO) are strongly affected by oxygen nonstoichiometry y, as well as by divalent ion doping level x. In the present study, we fabricated LSMO (x=0.4) thin films on SrTiO3 (STO) (001) and LaAlO3 (LAO) (001) under various pressures of oxygen ambient pO2, and evaluated their oxygen content 3−y using non-Rutherford elastic resonance spectroscopy. The change of their electric and magnetic properties was also measured and discussed. It was revealed that the oxygen content 3−y does not increase monotonically as pO2 increases. Curie temperature TC and insulator-metal transition temperature TIM were correlated with 3−y for the films on STO. The film on LAO of a quite high pO2 showed ferromagnetism and a metallic conductivity, unlike the films of lower pO2’s. The ferromagnetism is attributed to c∕a axis ratio closer to that of the bulk.
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