Infrared study of charge delocalization induced by pressure in themanganite
- 18 April 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 63 (18), 184410
- https://doi.org/10.1103/physrevb.63.184410
Abstract
We measured the pressure dependence of the room-temperature infrared absorption spectrum of the pseudocubic 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 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 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.
Keywords
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