Magnetite: Raman study of the high-pressure and low-temperature effects
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 -5.16±1.19K /GPa. Such a decrease is substantially larger than the one predicted by the mean-field Coulomb interaction model of the transition.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- May 2005
- DOI:
- arXiv:
- arXiv:0907.2456
- Bibcode:
- 2005JAP....97jA922G
- Keywords:
-
- 75.50.Dd;
- 81.40.Vw;
- 78.30.Hv;
- 72.60.+g;
- 63.20.Dj;
- 62.50.+p;
- Nonmetallic ferromagnetic materials;
- Pressure treatment;
- Other nonmetallic inorganics;
- Mixed conductivity and conductivity transitions;
- Phonon states and bands normal modes and phonon dispersion;
- High-pressure and shock wave effects in solids and liquids;
- Condensed Matter - Materials Science;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Journal of Applied Physics 97, 10A922 (2005)