Size effects in magnetotransport in sol-gel grown nanostructured manganites

作者：Shah N A^*; Solanki P S; Ravalia Ashish; Kuberkar D G

来源：Applied Nanoscience, 2015, 5(2): 135-141.

DOI：10.1007/s13204-014-0303-8

• Size effect
• Nanostructure
• Manganites
• Field sensitivity

We report the results of the studies on poly-crystalline nanostructured La0.7Pb0.3MnO3 (LPMO) manganites synthesized using sol-gel method employing metal acetate precursor route. Interestingly, it is observed that crystallite size decreases with increase in sintering temperature while microscopic investigations reveal the second grain growth in all the samples. A correlation between the grain morphology and secondary grain growth with the transport and magnetotransport in LPMO manganites has been established. Observation of large temperature sensitivity (similar to-28.29 %/K @ 0 T; >300 K) and field sensitivity (similar to-48.70 %/T @ 0.2 T; 5 K) in the samples sintered at higher temperature (similar to 1150 degrees C) has been understood in the light of observed secondary grain growth in the form of nanosized grains over the surface of primary grains.

• 出版日期2015-2