Raman study of the Verwey transition in magnetite at high-pressure and low-temperature: Effect of Al doping

Authors

L. Gasparov, University of North FloridaFollow
Z. Shirshikova, University of North Florida
T. M. Pekarek, University of North FloridaFollow
J. Blackburn, University of North FloridaFollow
V. Struzhkin, Carnegie Institution of Washington
A. Gavriliuk, Carnegie Institution of Washington
R. Rueckamp, University of Cologne
H. Berger, Ecole Polytechnique Fédérale de LausanneFollow

Document Type

Article

Publication Date

8-15-2012

Abstract

We employed Raman spectroscopy to investigate how the hydrostatic pressure affects the temperature of the Verwey transition in pure (Fe 3O 4) and Al-doped (Fe 2.8Al 0.2O 4) magnetite. In both samples, pressure suppresses the transition. The Al-doped sample displays no transition above 8 GPa. We do not observe such discontinuity in a pure magnetite, which suggests that the discontinuity is doping driven. Our Clausius-Clapeyron formula based analysis of the pressure-transition temperature dependence is in excellent agreement with our data in pure magnetite. The Al doping leads to a smaller entropy change and larger volume expansion consistent with partial charge ordering at the transition. © 2012 American Institute of Physics.

Publication Title

Journal of Applied Physics

Volume

112

Issue

4

Digital Object Identifier (DOI)

10.1063/1.4747834

ISSN

00218979

Citation Information

Gasparov, Shirshikova, Z., Pekarek, T. ., Blackburn, J., Struzhkin, V., Gavriliuk, A., Rueckamp, R., & Berger, H. (2012). Raman study of the Verwey transition in magnetite at high-pressure and low-temperature: Effect of Al doping. Journal of Applied Physics, 112(4), 043510–. https://doi.org/10.1063/1.4747834