Pressure Tuning of Electron-Phonon Coupling: The Insulator to Metal Transition in Manganites

Postorino, P and Congeduti, A and Dore, P and Sacchetti, A and Gorelli, F and Ulivi, L and Kumar, A and Sarma, DD (2003) Pressure Tuning of Electron-Phonon Coupling: The Insulator to Metal Transition in Manganites. In: Physical Review Letters, 91 (17). p. 4.

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Abstract

An extended temperature and pressure-dependent investigation is carried out on a La0.75Ca0.25MnO3 sample exploiting the infrared absorption technique coupled to a diamond anvil cell. The pressure dependence of the insulator to metal transition temperature T-IM is determined for the first time up to 11.2 GPa. The T-IM(P) curve we propose to model the present data has an exponential-like behavior with an associated characteristic pressure P-* playing the role of a decay constant. It is found that the equivalence between an external and an internal (chemical) pressure holds over a limited range of pressure, namely, Pless than or equal to2P(*). Moreover, a certain universality character is associated with the proposed model curve in its ability to account for a large class of low-disorder manganites characterized by intermediate electron-phonon coupling.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 Nov 2009 07:33
Last Modified:	19 Sep 2010 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/17276

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