Title
Relaxation phenomena at the metal-to-insulator transition in <tex>$La_{0.8}Sr_{0.2}MnO_{3}$</tex> single crystals Relaxation phenomena at the metal-to-insulator transition in <tex>$La_{0.8}Sr_{0.2}MnO_{3}$</tex> single crystals
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Solid state communications. - New York, N.Y.
Volume/pages
148(2008) :7/8 , p. 340-344
ISSN
0038-1098
ISI
000260907800020
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The time dependence of the resistance RAC of a La0.8Sr0.2MnO3 single crystal has been investigated in the vicinity of the metal-to-insulator transition temperature. We used local probe microscopy to show the existence, at room temperature, of coexisting clusters of micrometer size. Our analysis shows that relaxation effects can be described with a simple exponential contribution using a random resistor-network, based on phase separation between insulating and metallic domains. Our results clearly prove the existence of a percolation threshold over which no percolation path exists. Moreover, these results highlight the significant role of the remanent magnetization.
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