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


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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