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Giant magnetoresistance studies on La-(0.8-x)R(x)Sr(0.2)MnO(3) thin films (R=Pr,Nd,Gd,Ho)

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Title Giant magnetoresistance studies on La-(0.8-x)R(x)Sr(0.2)MnO(3) thin films (R=Pr,Nd,Gd,Ho)
 
Creator SHARMA, N
NIGAM, AK
PINTO, R
VENKATARAMANI, N
PRASAD, S
CHANDRA, G
PAI, SP
 
Subject magnetic-field
oxide
state
giant magnetoresistance
thin films
la-manganite compounds
 
Description The effect of substituting La by a smaller lanthanide element (R) in La(0.8-x)R(x)Sr(0.2)MnO(3) (x = 0.1; R = Pr, Nd, Gd, Ho) thin films on the resistivity (rho) and giant magnetoresistance (GMR) behaviour was studied. The magnitude of GMR shows a maximum as a function of temperature. The temperature at which the maximum value of GMR is observed was found to shift systematically towards higher temperatures (from 210 to 300 K) as the size of the substitution ion increases from Ho to Pr, rho(T) also shows a maximum which shifts to higher temperatures as the size of the substitution ion increases. The zero-field resistivity shows a systematic decrease as the size of R(3+) increases. This result is explained qualitatively by invoking the interrelation between the conduction electron hopping probability and the Mn-O-Mn bond angle distortion which, in turn, is governed by the size of the substitution ion. Our results show that the size of the rare earth substitution ion can play an important role in tailoring the resistivity and GMR behaviour of La-R-Sr-Mn-O thin films, particularly for room temperature applications.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-25T04:18:44Z
2011-12-26T12:49:44Z
2011-12-27T05:35:24Z
2011-07-25T04:18:44Z
2011-12-26T12:49:44Z
2011-12-27T05:35:24Z
1997
 
Type Article
 
Identifier JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 166(1-2), 65-70
0304-8853
http://dx.doi.org/10.1016/S0304-8853(96)00450-7
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6636
http://hdl.handle.net/10054/6636
 
Language en