National Changhua University of Education Institutional Repository : Item 987654321/14127
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 6507/11669
造访人次 : 30032357      在线人数 : 548
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/987654321/14127

题名: Thermoelectric Power and Resistivity of Lal.8Sr0.2CaCu2O6-δ and the Effects of O2 Hot-isostatic-press Annealing
作者: Liu, Chia-Jyi;Yamauchi, H.
贡献者: 物理學系
日期: 1995-05
上传时间: 2012-09-10T06:12:51Z
出版者: The American Physical Society
摘要: We have measured the resistivity and thermoelectric power of La1.8Sr0.2CaCu2O6-δ for 15≤T≤340 K. For the as-sintered sample heated under one atmosphere of oxygen, a minimum resistivity occurs at ca. 100 K, and the conductivity can be fitted to the form exp(T-1/2) or exp(T-1/4) for 30.3≤T≤86.8 K. The thermoelectric power varies as T1/2 for 20≤T≤200 K and exhibits a saturated value of ca. 100 μV/K for T≥230 K. Upon O2 HIP (hot isostatic press) treatment, the upturn of resistivity (metal- nonmetal transition) is suppressed and superconductivity ensues, and the thermoelectric power decreases in magnitude and displays a broad maximum at ca. 190 K in a manner similar to La2-xSrxCuO4-δ. It is conceivable that the O2 HIP treatment suppresses the metal-nonmetal transition as a result of increasing carrier concentration and possibly enhancing cation ordering. The possible origin of the metal-nonmetal transition is discussed.
關聯: Phys. Rev. B, 51(17): 11826-11829
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.html0KbHTML587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