Transport properties of La0.6Y0.1Ca0.3MnO3 compounds with different interfaces

被引：21
作者：
Fonseca, FC
Souza, JA
Jardim, RF [1 ]
Muccillo, R
Muccillo, ENS
Gouvêa, D
Jung, MH
Lacerda, AH
机构：
[1] Univ Sao Paulo, Inst Fis, Sao Paulo, SP, Brazil
[2] IPEN CNEN SP, CCTM, CMDMC, Sao Paulo, SP, Brazil
[3] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM USA
[4] IPEN CNEN SP, CCTM, Sao Paulo, SP, Brazil
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2004年 / 24卷 / 06期
基金：
巴西圣保罗研究基金会;
关键词：
perovskites; porosity; magnetoresistance; impedance;
D O I：
10.1016/S0955-2219(03)00446-1
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The electrical resistivity rho(T), magnetoresistivity rho(T,H), and impedance spectroscopy Z(omega,T) of polycrystalline La0.6Y0.1 Ca0.3MnO3 compounds with different intergranular surfaces were investigated. The interfaces were modified through controlled addition of pores in samples prepared by the sol-gel technique. X-ray diffraction, scanning electron microscopy, and mercury porosimetry analysis showed that all specimens are single phase having similar microstructures and differing only by the volume fraction of pore. rho(TH) and Z(omega,T) data revealed that all samples undergo a metal-insulator transition at Tsimilar to175 K. In addition, the Z(omega,T) data indicate two well defined contributions to the electrical resistivity. The rho(T,H) data exhibit features of colossal magnetoresistivity CMR phenomenon but were found to be independent of porosity. The combined results suggest that the CMR effect is mainly associated with percolation of metallic regions and weakly dependent on sample morphology. (C) 2003 Elsevier Ltd. All rights reserved.
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收藏
页码：1271 / 1275
页数：5
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