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題名: Grain Size Effect on the Colossal Magnetoresistance in Granular Perovskite La0.7Pb0.3MnO3
作者: Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, L.;Wu, K. M.;Ho, Y. W.;Shih, Yu-Tai
貢獻者: 物理學系
關鍵詞: Granular;Perovskite;Magnetoresistance;Magnetotransport
日期: 2006-12
上傳時間: 2013-01-07T09:25:38Z
出版者: World Scientific Publishing Co.
摘要: Magnetic behaviors and transport properties in granular perovskite La0.7Pb0.3MnO3 with different grain sizes have been synthesized. The results show that magnetic susceptibility, ferromagnetic ordering temperature and magnetoresistance are affected by the grain size. These compounds with different grain sizes exhibit two kinds of magnetoresistance origins, intragrain double exchange and intergrain interfacial tunneling. With the increasing grain size, the intrinsic transport is dominant while the extrinsic tunneling gradually disappears. Thus, the basis of magnetotransport mechanism is the result of competition between the double exchange interaction and the interfacial tunneling effect.
關聯: Modern Physics Letters B, 20(29): 1859-1865
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