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Weak charge-ordering behavior in phase separated (Ln(1/3)Sm(2/3))(2/3)Ca1/3MnO3 (Ln = Pr and La) manganites

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Title Weak charge-ordering behavior in phase separated (Ln(1/3)Sm(2/3))(2/3)Ca1/3MnO3 (Ln = Pr and La) manganites
 
Creator ASTHANA, S
DHO, J
BAHADUR, D
 
Subject colossal magnetoresistance
pr0.67ca0.33mno3
pr1-xcaxmno3
perovskite
transition
state
manganites
magnetoresistance
colossal magnetoresistance
electronic phase separation
 
Description We have studied a weak charge-ordering behavior in phase separated (Ln(1/3)Sm(2/3))(2/3)Ca1/3MnO3 (Ln = Pr and La) manganites with same hole doping but slightly different tolerance factors. The M(T) and p(T) curves of the Pr-sample showed an anomaly caused by a weak charge-order (CO) transition at similar to 210 K. while that of La-sample did not. However, the La-sample displayed a weak anomaly related to the CO instability in the derivative curve of the temperature dependent magnetoresistance. This result is understood on the basis that the CO phase in La-sample is partly suppressed by a large magnetic field of similar to 80 kOe, while in Pr-sample it is not collapsed in that field scale. Our data support the existence of charge-ordering, electronic phase separation and a field-induced reduction of weak CO instability for La-sample, which can contribute towards high MR especially at lower temperatures due to partial melting of CO phase and/or percolation behavior. (c) 2007
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-27T03:37:25Z
2011-12-26T12:57:43Z
2011-12-27T05:44:54Z
2011-08-27T03:37:25Z
2011-12-26T12:57:43Z
2011-12-27T05:44:54Z
2007
 
Type Article
 
Identifier SOLID STATE COMMUNICATIONS, 143 (11-12), 522-526
0038-1098
http://dx.doi.org/10.1016/j.ssc.2007.07.008
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11530
http://hdl.handle.net/10054/11530
 
Language en