The sample are prepared by co-sintering the pure 3D ferromagnetic colossal magnetoresistance La0.7Sr0.3MnO3 (113) and the 2D spin-glass magnetic insulator La0.7Sr0.3MnO3¡ESrO (214) with an ordered 2D magnetic-insulator superstructure. Increase the magnetic scattering and collision probabilities of the carries on the interface of the two kinds of CMR materials. The LFMR is enhanced by the electron scattering between these two phases. (La0.7Sr1.3MnO4)x / ( La0.7Sr0.3MnO3)1-x composites with x=0.1¡B0.15¡B0.2¡B0.3¡B0.5 have been fabricated by sintering the mixture of the pure La0.7Sr0.3MnO3 (n=¡Û) and the La0.7Sr1.3MnO4(n=1) at 1400 for 24 hours. Part of the 113 phase reacted with 214 phase during the 1400¢J annealing process and formed the antiferromagnetic phase , La1-2ySr2+2yMn2O7 (327), with the unknown content, y. The £l-H curve shows the magnetic interaction between the interface grain numbers of the 113 and 327 affects the effect of the low field magnetoresistance effect.

京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第19522号 / 理博第4182号 / 新制||理||1600(附属図書館) / 32558 / 京都大学大学院理学研究科化学専攻 / (主査)教授 吉村 一良, 教授 有賀 哲也, 教授 北川 宏 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM