Magnetite: Raman study of the high-pressure and low-temperature effects - art. no. 10A922
We report the results of a low-temperature (300 K-15 K) high-pressure (up to 22 GPa) 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 dT(v)/dP is found to be -5.16 +/- 1.19 K/GPa. Such a decrease is substantially larger than the one predicted by the mean-field Coulomb interaction model of the transition. (c) 2005 American Institute of Physics.
Univ N Florida, Dept Chem & Phys, Jacksonville, FL 32224 USA. Rhein Westfal TH Aachen, Inst Phys, Aachen, D-52056 Germany. EPFL, Lausanne, CH-1015 Switzerland. Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. Gasparov, LV, Univ N Florida, Dept Chem & Phys, St Johns Bluff Rd, Jacksonville, FL 32224 USA.
ISI Document Delivery No.: 940TP
Cited Reference Count: 20
49th Annual Conference on Magnetism and Magnetic Materials
NOV 07-11, 2004
Phys Conf Inc, IEEE Magnet Soc, Amer Ceram Soc, USN, Off Naval Res, Amer Phys Soc, ASTM Int, Minerals, Met & Mat Soc
Record created on 2006-10-03, modified on 2016-08-08