Magnetite: Raman study of the high-pressure and low-temperature effects

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. Incr...

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Bibliographic Details
Published inarXiv.org
Main Authors Gasparov, L V, Arenas, D, K -Y Choi, Guntherodt, G, Berger, H, ro, L, Margaritondo, G, Struzhkin, V V, Hemley, R
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 14.07.2009
Subjects
Interaction models
Iron oxides
Magnetite
Physics - Materials Science
Physics - Strongly Correlated Electrons
Pressure effects
Temperature effects
Transition temperature
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0907.2456