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.
Pressure_Tuning.pdf - Published Version
Restricted to Registered users only
Download (212Kb) | Request a copy
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|
|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|
Actions (login required)