Magnetite: Raman study of the high-pressure and low-temperature effects
L.V. Gasparov, D. Arenas, K.-Y. Choi, G. Guntherodt, H. Berger, L., Forro, G. Margaritondo, V. V. Struzhkin, R. Hemley
TL;DR
This study investigates how high pressure affects the Verwey transition in magnetite using Raman spectroscopy, revealing a linear decrease in transition temperature with pressure, which challenges existing theoretical models.
Contribution
It provides the first detailed measurement of the pressure dependence of the Verwey transition temperature in magnetite using Raman spectroscopy.
Findings
Verwey transition temperature decreases linearly with pressure
Pressure coefficient dTV/dP is approximately -5.2 K/GPa
Observed decrease exceeds predictions of mean-field Coulomb models
Abstract
We report the results of a low-temperature (300K-15K) high-pressure (up to 22GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey transition to determine how the transition temperature changes with the quasihydrostatic pressure. Increase of the pressure results in the linear decrease of the Verwey transition temperature, with no discontinuity. The corresponding pressure coefficient dTV/dP is found to be ~ -5.2 K/GPa. Such a decrease is substantially larger than the one predicted by the mean-field Coulomb interaction model of the transition.
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