Phys. Rev. Lett. 91, 175501 (2003) [4 pages]Pressure Tuning of Electron-Phonon Coupling: The Insulator to Metal Transition in ManganitesReceived 17 February 2003; published 20 October 2003 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 TIM is determined for the first time up to 11.2 GPa. The TIM(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, P≤2P*. 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.175501
DOI:
10.1103/PhysRevLett.91.175501
PACS:
63.20.Kr, 62.50.+p, 71.30.+h, 78.30.–j
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