National Changhua University of Education Institutional Repository : Item 987654321/14166
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 6507/11669
造访人次 : 29730487      在线人数 : 420
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/987654321/14166

题名: Nitrogen-annealing Effects on the Electrical Resistivity and Thermopower of Layered La1.4Sr1.6Mn2O Ceramics
作者: Liu, Chia-Jyi;Sheu, C. S.;Huang, M. S.
贡献者: 物理學系
日期: 2000-06
上传时间: 2012-09-10T06:13:45Z
出版者: The American Physical Society
摘要: We report measurements of thermopower and resistivity as a function of temperature on bilayered La1.4Sr1.6Mn2O7+δ ceramics treated in different atmosphere in H=0 and 5 T. Chemical titration is used to determine both valence of manganese and content of oxygen. As the sample is annealed in nitrogen, the resistivity of La1.4Sr1.6Mn2O7+δ reduces; the peak resistivity shifts to a higher temperature; the magnetoresistance ratio is enhanced; and the thermopower shifts to a more negative value over the investigated temperature range as compared to the sample annealed in oxygen. These results show that annealing samples in flowing nitrogen has the same effect as the pressure-induced shift of transport behavior. In addition, thermopower data of our ceramic materials resemble those within the ab plane of a single crystal. Transport data will be discussed in terms of the polaron hopping.
關聯: Phys. Rev. B, 61(21): 14323-14326
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
index.html0KbHTML514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