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)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
