Vol. 18 No. 1 (2008)
Papers

Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>

Pham Thanh Phong
Ninh Hoa Department of Education and Training, Khanh Hoa, Vietnam
Bio
Do Hung Manh
Institute of Materials Science, VAST
Le Van Hong
Institute of Materials Science, VAST
Nguyen Xuan Phuc
Institute of Materials Science, VAST
Nguyen Van Khiem
Department of Natural Sciences, Hong Duc University, 307 Le Lai Str. Thanh Hoa City, Vietnam
Vu Van Hung
Department of Natural Sciences, Hong Duc University, 307 Le Lai Str. Thanh Hoa City, Vietnam

Published 18-07-2008

How to Cite

Phong, P. T., Manh, D. H., Hong, L. V., Phuc, N. X., Khiem, N. V., & Hung, V. V. (2008). Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>. Communications in Physics, 18(1), 48–57. https://doi.org/10.15625/0868-3166/18/1/10690

Abstract

In this study we report the effect of sintering temperature on the low field magnetoresistance (LFMR) of La0.7Ca0.3MnO3 manganite synthesized through sol-gel technique. The La0.7Ca0.3MnO3 has been sintered at 600°C, 700°C, 800°C, 900°C and 1200°C. The crystallite as well as particle size also show strong dependence on the sintering temperature. While the ferromagnetic – paramagnetic (FM-PM) transition temperature remains almost constant, the metal – insulation transition temperature drop gradual and the low field magnetoresistance (LFMR) increase with a decrease in grain size. We have analyzed our data based on the spin – polarized transport of conduction electrons at the grain boundaries.

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