Chemical pressure effect on CMR behavior of Sr substituted La0.67Ca0.33-xSrxMnO3

A series of systematic substitution of isovalent Sr ion into the Ca site of La0.67Ca0.33-xSrxMnO3 system has been studied for different x values ranging from x=0.00,0.033,0.066,...,0.33. It is observed that at x=0.066, the system begins to exhibit multiphasic behavior with the onset of X-ray shoulde...

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Published inPhysica. B, Condensed matter Vol. 400; no. 1-2; pp. 155 - 162
Main Authors MISHRA, D. K, SAHU, D. R, MISHRA, P. K, BEHERA, D, PRADHAN, A. K, ROUL, B. K
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier 15.11.2007
Subjects
Colossal magnetoresistance
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Manganites
Physics
Spin glasses
Electrical conductivity
Pressure effects
Curie point
Magnetization
Metal-insulator transition
Spin glass cluster
Colossal magnetoresistance
Low field
Cluster glass
Curie temperature
Ion substitution
Chemical pressure
Chemical composition
Electron band width
Manganites
Space group
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Summary:A series of systematic substitution of isovalent Sr ion into the Ca site of La0.67Ca0.33-xSrxMnO3 system has been studied for different x values ranging from x=0.00,0.033,0.066,...,0.33. It is observed that at x=0.066, the system begins to exhibit multiphasic behavior with the onset of X-ray shoulder peak at 2theta value of 32.96. In this paper, we report low field SQUID magnetization behavior and electrotransport properties of the above system with x=0.0,0.033 and 0.066. It is noted that larger cationic size (Sr2+) does not allow the system to attain low bandwidth, which is the important parameter to control the electric and magnetic properties including Curie temperature (Tc) and metal insulator transition temperature (TIM). The role of Sr2+ ion substitution as larger radius with respect to Ca2+ ion in the La0.67Ca0.33-xSrxMnO3 system can specifically be assigned to enhance the electron bandwidth (W), which promotes higher Tc and TIM. In addition to this, an interesting spin glass cluster and transition phenomena are observed at low temperature region for x=0.066.
Bibliography:ObjectType-Article-2
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content type line 23
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2007.07.002