Electrical and Magnetic Properties and Colossal Magnetoresistance Effect of La1-xBixMnO3

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概要

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• Perovskite-type La1-xBixMnO3 (LBMO) crystals, which were prepared by doping a Bi atom for a La atom in LaMnO3, were shown to exhibit the colossal magnetoresistance (CMR) effect. Samples were produced by sintering in an air atmosphere that depended on the Bi composition ratio $x$. X-ray diffraction measurements showed that the LBMO crystal structure can be orthorhombic (or rhombohedral) with $\gamma\ (=c/a)=1.02$ for $0.0<x<0.3$, cubic with $\gamma=1.005$ for $0.3<x<0.5$ or monoclinic with $\gamma=1.014$ for $0.5<x$. The CMR effect of LBMO for $x=0.2$ was approximately 400% at 88 K. In addition, the magnetoresistance of LBMO was found to be proportional to the square of magnetization. On the basis of these results, the CMR occurrence mechanics of LBMO were shown to significantly contribute to a Mn3+–Mn4+ double exchange interaction, which is closely associated with the cooperative phenomenon in the Jahn–Teller effect.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-11-15

著者

• Shindo Haruo

  Graduate School of Engineering, Tokai University, 1117 Kita-kaname, Hiratsuka, Kanagawa 259-1292, Japan

• Ogawa Takashi

  Graduate School of Engineering, Tokai University, 1117 Kita-kaname, Hiratsuka, Kanagawa 259-1292, Japan

• Takeuchi Hiromasa

  Graduate School of Engineering, Tokai University, 1117 Kita-kaname, Hiratsuka, Kanagawa 259-1292, Japan

• Koizumi Yoshiharu

  Graduate School of Engineering, Tokai University, 1117 Kita-kaname, Hiratsuka, Kanagawa 259-1292, Japan

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• Electrical and Magnetic Properties and Colossal Magnetoresistance Effect of La1-xBixMnO3

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