We investigated the electronic and vibrational properties of magnetite at temperatures from 300 K down to 10 K and for pressures up to 10 GPa by far-infrared reflectivity measurements. The Verwey transition is manifested by a drastic decrease of the overall reflectance and the splitting of the phonon modes as well as the activation of additional phonon modes. In the whole studied pressure range, the down-shift of the overall reflectance spectrum saturates and the maximum number of phonon modes is reached at a critical temperature, which sets a lower bound for the Verwey transition temperature . Based on these optical results, a pressure-temperature phase diagram for magnetite is proposed.
Pressure dependence of the Verwey transition in magnetite: An infrared spectroscopic point of view
J. Ebad-Allah, L. Baldassarre, M. Sing, R. Claessen, V. A. M. Brabers, C. A. Kuntscher; Pressure dependence of the Verwey transition in magnetite: An infrared spectroscopic point of view. J. Appl. Phys. 1 October 2012; 112 (7): 073524. https://doi.org/10.1063/1.4758303
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