National Changhua University of Education Institutional Repository : Item 987654321/15379
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 6507/11669
造访人次 : 29957032      在线人数 : 507
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 进阶搜寻

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.ncue.edu.tw/ir/handle/987654321/15379

题名: Structure and Properties of (La2−xSrx)MnO4 Compounds
作者: Wu, M. S.;Kao, H. C. I.;Sheu, H. S.;Chiang, Y. P.;Horng, Lance;Hsueh, R. F.;Young, S. L.;Pong, W. F.;Huang, J. H.
贡献者: 物理學系
关键词: (La2-xSrx)MnO4;Magnetoresistance;K2NiF4 structure;Jahn-Teller effect;Preparation
日期: 2005-01
上传时间: 2013-02-05T02:18:41Z
出版者: World Scientific Publishing
摘要: Polycrystalline single phase (La2-xSrx)MnO4 (1.10≤x≤1.40) samples were prepared by a citrate precursor method. They have tetragonal K2NiF4 structure with a space group of 14/mmm, increasing x, unit-cell a-axis increases and c-axis decreases, which is a result of decreasing of the Jahn-Teller effect due to the increase of the Mn(IV) ion. Spin glass state exists at low temperature and a hump observed from the susceptibility (χ) measurement is probably caused by the interactions of several magnetic phases. Among them, (La0.6Sr1.4)MnO4 has the largest magnetoresistance ratio ([ρ(H)-ρ(0)]/ρ(0)), which reaches to 78.4% at 48 K. It is not possible to obtain single phase materials with 0.60≤x≤1.00 in the heat treatment temperature range of 1000-1600°C. Impurities were easily observed under SEM and X-ray diffraction patterns. Increasing the heating period and decreasing the temperature, the amount of ABO3 perovskite phase increases. In order to extend the solubility range, of the SrO in the (La2-xSrx)MnO4, it probably needs a higher temperature (>1600°C) and a shorter heat treatment period (<1 h).
關聯: Int. J. Mod. Phys. B, 19(1-3): 541-548
显示于类别:[物理學系] 期刊論文

文件中的档案:

档案 大小格式浏览次数
2020200710122.pdf70KbAdobe PDF484检视/开启


在NCUEIR中所有的数据项都受到原著作权保护.

 

DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈