Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-02-20
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures
Scientific paper
The optical properties of magnetite at room temperature were studied by infrared reflectivity measurements as a function of pressure up to 8 GPa. The optical conductivity spectrum consists of a Drude term, two sharp phonon modes, a far-infrared band at around 600 cm$^{-1}$, and a pronounced mid-infrared absorption band. With increasing pressure both absorption bands shift to lower frequencies and the phonon modes harden in a linear fashion. Based on the shape of the MIR band, the temperature dependence of the dc transport data, and the occurrence of the far-infrared band in the optical conductivity spectrum the polaronic coupling strength in magnetite at room temperature should be classified as intermediate. For the lower-energy phonon mode an abrupt increase of the linear pressure coefficient occurs at around 6 GPa, which could be attributed to minor alterations of the charge distribution among the different Fe sites.
Baldassarre Luca
Brabers V. A. M.
Claessen Ralph
Ebad-Allah J.
Kuntscher Christine A.
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