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Browse Journals & Magazines > Applied Physics Letters ...> Volume:77 Issue:1 Help

Grain-boundary effects on the electrical resistivity and the ferromagnetic transition temperature of La0.8Ca0.2MnO3

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1 Author(s)
Fu, Yonglai ; Department of Physics, National University of Singapore, Singapore 119260

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In this letter, grain-boundary effects on the electrical transport and the ferromagnetic transition temperature were investigated in La0.8Ca0.2MnO3. The different ferromagnetic transition temperature (45 K) and the different metal–semiconductor transition temperature (62 K) were observed in the samples with different grain boundaries. Wide grain boundaries can induce large grain-boundary effects on grain, and small grain size also induces large grain-boundary effects on grain due to the increase of grain boundaries. The possible mechanism of grain-boundary effect is explained as the strain effect of grain induced by the distortion at grain boundaries. The strain of grains should enhance the ferromagnetic double exchange interaction. © 2000 American Institute of Physics.

Published in:
Applied Physics Letters  (Volume:77 ,  Issue: 1 )

Date of Publication: Jul 2000

Page(s):
118 - 120
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.126908
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Jul 2000

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