National Changhua University of Education Institutional Repository : Item 987654321/14166
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 6498/11670
Visitors : 25675917      Online Users : 81
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item:

Title: Nitrogen-annealing Effects on the Electrical Resistivity and Thermopower of Layered La1.4Sr1.6Mn2O Ceramics
Authors: Liu, Chia-Jyi;Sheu, C. S.;Huang, M. S.
Contributors: 物理學系
Date: 2000-06
Issue Date: 2012-09-10T06:13:45Z
Publisher: The American Physical Society
Abstract: 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.
Relation: Phys. Rev. B, 61(21): 14323-14326
Appears in Collections:[Department of Physics] Periodical Articles

Files in This Item:

File SizeFormat

All items in NCUEIR are protected by copyright, with all rights reserved.


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