부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jmmm.2008.12.024 Byline: Z.Y. Zhou, G.S. Luo, F.Y. Jiang Keywords: Manganites; Magnetoresistance; Spin-dependent scattering and tunneling Abstract: The effect of Ba(La)TiO.sub.3 doping on the structure and magnetotransport properties of La.sub.2/3Sr.sub.1/3MnO.sub.3(LSMO)/xBa(La)TiO.sub.3 (x=0.0, 1.0, 5.0mol%) have been investigated. The X-ray diffraction patterns and microstructural analysis show that BaTiO.sub.3 and LSMO phases exist independently in BaTiO.sub.3-doped composites. The metal-insulator transition temperature (T.sub.MI) decreases whereas the maximum resistivity increases very quickly by the increase of BaTiO.sub.3 doping level. The partial substitution of Ba by La(0.35mol%) results in a decrease in resistivity of LSMO/xBa(La)TiO.sub.3 composites. Magnetoresistance of BaTiO.sub.3-doped composites decreases monotonously in the temperature range 200-400K in a magnetic field of 5T, which is completely different from that of LSMO compound. The value of MR decreases at low field (H Author Affiliation: School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi 330031, PR China Article History: Received 6 April 2008; Revised 20 August 2008