Record Details

Magnetic and electrical transport properties of La(0.67)Ca(0.33)MnO(3) (LCMO): xZnO composites

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Magnetic and electrical transport properties of La(0.67)Ca(0.33)MnO(3) (LCMO): xZnO composites
 
Creator DAS, D
SRIVASTAVA, CM
BAHADUR, D
NIGAM, AK
MALIK, SK
 
Subject room-temperature magnetoresistance
low-field magnetoresistance
colossal magnetoresistance
enhanced magnetoresistance
giant magnetoresistance
la0.7ca0.3mno3
resistivity
percolation
system
films
 
Description We have synthesized La(0.67)Ca(0.33)MnO(3) (LCMO):xZnO (0 less than or equal to x less than or equal to 0.475) composites through a citrate gel route and have characterized them for magnetic and magnetotransport properties. In lower concentrations (x less than or equal to 0.13), ZnO mostly goes into the perovskite lattice substituting Mn in LCMO and segregates less in the grain boundary region, but at higher concentration (x > 0.13) it segregates mostly at the grain boundaries of LCMO and influences the transport properties significantly. A model is proposed which describes the overall resistivity of the system as a parallel combination of a low resistive intragrain conducting path and a high resistive intergrain insulating path. Using this approach, the grain and grain boundary contributions to the overall resistivity are separated for all the composites. The field dependent resistivity shows that all the composites have higher values of MR at the transition temperatures (T(MI)) compared to that in pure LCMO (x = 0). The highest value of MR is obtained for x = 0.10 and is 76.6% at 80 kOe field near T(MI).
 
Publisher IOP PUBLISHING LTD
 
Date 2011-08-03T20:23:19Z
2011-12-26T12:54:23Z
2011-12-27T05:42:15Z
2011-08-03T20:23:19Z
2011-12-26T12:54:23Z
2011-12-27T05:42:15Z
2004
 
Type Article
 
Identifier JOURNAL OF PHYSICS-CONDENSED MATTER, 16(23), 4089-4102
0953-8984
http://dx.doi.org/10.1088/0953-8984/16/23/024
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9138
http://hdl.handle.net/10054/9138
 
Language en