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Lattice effect on the magnetic and magneto-transport properties of (La1/3Sm2/3)(0.67)Ba0.33-xSrxMnO3 (x=0.0, 0.1, 0.2 and 0.33) compounds

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Title Lattice effect on the magnetic and magneto-transport properties of (La1/3Sm2/3)(0.67)Ba0.33-xSrxMnO3 (x=0.0, 0.1, 0.2 and 0.33) compounds
 
Creator ASTHANA, S
NIGAM, AK
MALIK, SK
BAHADUR, D
 
Subject ca-mn-o
colossal magnetoresistance
manganites
transport
manganites
magneto-transport
sr-substitution
 
Description The effect of substituting Sr for Ba on the magneto-transport and magnetic properties of (La1/3Sm2/3)(0.67)Ba0.33MnO3 system, has been investigated. The samples, (La1/3Sm2/3)(0.67)Ba0.33-xSrMnO3 (x=0,0, 0.1, 0.2 and 0.33), synthesized by citrate gel route, crystallize in an orthorhombic structure (space group Pnma, no. 62). The unit cell volume decreases while the metal-insulator transition temperature (T-MI) increases with increasing Sr content. The localization of charge carriers occurs at low temperatures and becomes more pronounced with decreasing Sr content which leads to an enhancement of resistivity. This could be understood by the variation of Mn-O-Mn bond-distance and angle. Reappearance of semiconducting behavior (d rho/dT< 0) is observed only in samples with x = 0 and x = 0.1 below certain temperature (T< T-MI). These samples exhibit thermal irreversibility behavior for a field-cooled (FC) and zero-field-cooled (ZFC) magnetization data in a magnetic field of 100 Oe. This is ascribed to the competition between the superexchange and double exchange interactions. The change in physical properties has been correlated to chemical parameters such as ionic radii, tolerance factor, electronegativity and variation in Mn-O-Mn angle. (c) 2006
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-28T11:13:14Z
2011-12-26T12:59:10Z
2011-12-27T05:50:10Z
2011-07-28T11:13:14Z
2011-12-26T12:59:10Z
2011-12-27T05:50:10Z
2008
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 450(1-2), 136-141
0925-8388
http://dx.doi.org/10.1016/j.jallcom.2006.10.067
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7386
http://hdl.handle.net/10054/7386
 
Language en