Low-field magnetoresistance in La^sub 0.7^Sr^sub 0.3^MnO3/BaTiO3 composites

• Published in: Journal of materials science. Materials in electronics Vol. 24; no. 4; p. 1389
• Main Authors: Thanh, T D, Phong, P T, Manh, D H, Khien, N V, Hong, L V, Phan, T L, Yu, S C
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01.04.2013
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-012-0943-y

A manganite composite series of (1 â ' x)La^sub 0.7^Sr^sub 0.3^MnO3/xBaTiO3 (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 insulatorâ[euro]"metal transition temperature was shifted towards lower temperatures, and resistivity increases with increasing BaTiO3 content in (1 â ' x)La^sub 0.7^Sr^sub 0.3^MnO3/xBaTiO3. Meanwhile, the ferromagneticâ[euro]"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 Curieâ[euro]"Weiss law-like behavior. The nature of this phenomenon is explained in detail.[PUBLICATION ABSTRACT]