Congeduti, A. ; Postorino, P. ; Dore, P. ; Nucara, A. ; Lupi, S. ; Mercone, S. ; Calvani, P. ; Kumar, A. ; Sarma, D. D. (2001) Infrared study of charge delocalization induced by pressure in the La0.75Ca0.25MnO3 manganite Physical Review B: Condensed Matter and Materials Physics, 63 (18). 184410 _1-184410 _5. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v63/i18/e184410
Related URL: http://dx.doi.org/10.1103/PhysRevB.63.184410
Abstract
We measured the pressure dependence of the room-temperature infrared absorption spectrum of the pseudocubic La0.75Ca0.25MnO3 manganite. On increasing pressure up to 10 Gpa we observe the increase of a broad band associated with polaronic absorption, which partially screens the high-frequency phonon at high pressures. We also measured absorption spectra of the same sample as a function of temperature, and of the layered Sr1.5La0.5MnO4 manganite as a function of pressure. The comparison between different sets of spectra clearly shows that the increase of the broad-band absorption observed in the La0.75Ca0.25MnO3 manganite is due to a pressure-induced charge delocalization process. However, the metallic state is not achieved at room temperature, at least in the explored pressure range.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 46464 |
| Deposited On: | 04 Jul 2011 11:53 |
| Last Modified: | 04 Jul 2011 11:53 |
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