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Small polaron transport and colossal magnetoresistance in La(2/3)Ca(1/3)MnO(3)

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Title Small polaron transport and colossal magnetoresistance in La(2/3)Ca(1/3)MnO(3)
 
Creator SRIVASTAVA, CM
SRIVASTAVA, NB
SINGH, LN
BAHADUR, D
 
Subject double-exchange
charge-carriers
single-crystals
manganites
la1-xsrxmno3
perovskite
transition
physics
oxides
 
Description Despite numerous attempts to explain the phenomenon of transport and magnetoresistance in manganites based on Jahn- Teller phonon coupling and double exchange mechanisms, satisfactory results could not be reached. The small polaron transport mechanism, based on the valence exchange arising from Madelung energy, is shown to account for the resistivity and magnetoresistance of the doped manganite La(2/3)Ca(1/3)MnO(3) in the ferromagnetic range. The transport equation for the correlated polaron based on the Holstein Hamiltonian shows the well known transition from the low temperature band to the localized polaron hopping conductivity at high temperature in agreement with experiment. The present attempt is to demonstrate that the complexity of the problem that involves the interplay between the spin and charge order on one hand and itinerant and localized behavior on the other for a simple ferromagnetic metal system of manganites is best described by the correlated small polaron model leaving the more complicated systems for future studies. (C) 2009 [DOI: 10.1063/1.3123764]
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T14:37:27Z
2011-12-26T12:49:49Z
2011-12-27T05:35:33Z
2011-07-16T14:37:27Z
2011-12-26T12:49:49Z
2011-12-27T05:35:33Z
2009
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 105(9), -
0021-8979
http://dx.doi.org/10.1063/1.3123764
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4454
http://hdl.handle.net/10054/4454
 
Language en