Effects of Ca-doping on the transport and magnetic properties of La1.4Sr1.6Mn2O7

C. M. Kuo, S. Y. Wu, W. H. Li, K. C. Lee, H. D. Yang

研究成果: 雜誌貢獻會議論文同行評審

1 引文 斯高帕斯(Scopus)


Detailed structural analysis, DC electric resistivity, and AC magnetic susceptibility measurements have been performed to study the lattice, transport, and magnetic properties of polycrystalline La1.4(Sr1-xCax)1.6Mn2O7, with x = 0, 0.1, 0.2, and 0.3. We concentrate on the effects that resulted from the partial replacement of Sr2+ ions by smaller Ca2+ ions. All four compounds are single phase, with a structure that may be well-described using a tetragonal symmetry of space group I4/mmm. Ca doping causes the insulator-to-metal and paramagnetic-to-ferromagnetic transitions to occur at lower temperatures and the system re-enters the insulating state at lower temperatures. Several peaks are clearly seen in the temperature dependence of the AC susceptibility. Based on their behavior under an applied DC field, these peaks may be grouped into three types of different origin associated with charge ordering, Mn spin ordering, and magnetic fluctuations.

頁(從 - 到)142-144
期刊Journal of Magnetism and Magnetic Materials
出版狀態已出版 - 2月 2000
事件Proceedings of the 1999 International Symposium on Advanced Magnetic Technologies (ISAMT'99) - Taipei, Taiwan
持續時間: 24 5月 199925 5月 1999


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