Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La0.7Ca0.3MnO3

Pham Thanh Phong, Do Hung Manh, Le Van Hong, Nguyen Xuan Phuc, Nguyen Van Khiem, Vu Van Hung
Author affiliations

Authors

  • Pham Thanh Phong Ninh Hoa Department of Education and Training, Khanh Hoa, Vietnam
  • 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

DOI:

https://doi.org/10.15625/0868-3166/18/1/29

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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Published

18-07-2008

How to Cite

[1]
P. T. Phong, D. H. Manh, L. V. Hong, N. X. Phuc, N. V. Khiem, and V. V. Hung, “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>”;, Comm. Phys., vol. 18, no. 1, pp. 48–57, Jul. 2008.

Issue

Vol. 18 No. 1 (2008)

Section

Papers

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