Bhattacharya, D and Das, P and Pandey, A and Raychaudhuri, A K and Chakraborty, A and Ojha, V N (2001) On the factors affecting the high temperature insulator-metal transition in rare-earth manganites. Journal of Physics-Condensed Matter, 13 (20). L431 -L439. ISSN 0953-8984

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Abstract

The measurement of resistivity (rho) across a wide temperature (T) range-from 15 to 1473 K-in the rare-earth manganite series of compounds reveals a very interesting feature: the normally observed insulating pattern beyond T-c (the Curie point) undergoes a broader transition and eventually gives way to a reentrant metallic pattern around a characteristic temperature T*. Considering a model with coexisting metallic and non-metallic phases beyond T-c, it has been shown that T* marks the temperature at which the metallic volume fraction v(m) (T) reaches 100% as a result of progressive removal of lattice distortion at higher temperature. T* is found to be dependent on the carrier concentration as well as on the average A-site radius ((r(A))) for a fixed carrier concentration

Item Type:	Article
Uncontrolled Keywords:	Condensed Matter
Subjects:	Physical Properties
Divisions:	UNSPECIFIED
Depositing User:	Mrs Chandana Patra
Date Deposited:	14 Feb 2012 11:44
Last Modified:	27 Mar 2016 13:26
URI:	http://cgcri.csircentral.net/id/eprint/843

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