Low-field magnetoresistance in La0.7Sr0.3MnO3/BaTiO3 composites

• Published in: Journal of materials science. Materials in electronics 2013-04, Vol.24 (4), p.1389-1394
• Main Authors: Thanh, T. D., Phong, P. T., Manh, D. H., Khien, N. V., Hong, L. V., Phan, T. L., Yu, S. C.
• Format: Article
• Language: English
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrical engineering. Electrical power engineering; Electronics; Exact sciences and technology; Magnetic properties and materials; Magnetotransport phenomena, materials for magnetotransport; Manganites; Materials; Materials Science; Metals. Metallurgy; Optical and Electronic Materials; Physics; Powder metallurgy. Composite materials; Production techniques; Technology
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-012-0943-y

A manganite composite series of (1 −  x )La 0.7 Sr 0.3 MnO 3 / x BaTiO 3 ( x  = 0, 0.06, 0.12, and 0.18) has been fabricated by solid-state reaction combined with a high-energy mechanical milling method. Experimental results revealed that the insulator–metal transition temperature was shifted towards lower temperatures, and resistivity increases with increasing BaTiO 3 content in (1 −  x )La 0.7 Sr 0.3 MnO 3 / x BaTiO 3 . Meanwhile, the ferromagnetic–paramagnetic transition temperature was almost unchanged. The increase in magnetoresistance was observed in the all composites at whole measurement temperatures under an applied magnetic field of 3 kOe. Here, temperature dependences of magnetoresistance display a Curie–Weiss law-like behavior. The nature of this phenomenon is explained in detail.