Abstract
We present in this work the lanthanum substitution effects on the physical properties in the deficient Pr0.5–x LaxSr0.3MnO3 powder samples. The substitution of Pr by La leads to an increase of the cation size. X-ray diffraction investigations show that our synthesized samples crystallize in a distorted orthorhombic perovskite structure with Pnma space group. Magnetic and transport measurements show that the properties are correlated to the average ionic radius of the A site. All our samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. Such behaviour observed in our samples with about 90% of Mn4+ can not be explained by the double exchange interactions. Curie temperature shifts to higher values with increasing lanthanum content. Resistivity measurements versus temperature show a semiconducting-metallic transition for all samples when the temperature decreases. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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