Volume 104, Number 1, October 2013
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||28 October 2013|
Pressure dependence of Morin transition in α-Fe2O3hematite
1 IMPMC, CNRS UMR 7590, Université P&M Curie - 4 Place Jussieu, F-75252 Paris, France
2 Paul Scherrer Institut - CH-5232 Villigen PSI, Switzerland
3 Institut Laue Langevin - F-38043 Grenoble, France
Received: 20 May 2013
Accepted: 30 September 2013
We report high-pressure neutron diffraction data on the Morin-transition TM in α-Fe2O3 hematite, up to 8 GPa and under hydrostatic conditions. We find a strictly linear pressure coefficient of with no evidence for intermediate magnetic states as indicated by all previous non-hydrostatic measurements. The behaviour of TM is highly regular and can well be explained within the framework of Artman et al.'s single-ion model if a change of the single-ion anisotropy energy by +1%/GPa is assumed. Such a value seems not to be unusual for iron oxides.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 61.05.F- – Neutron diffraction and scattering / 75.50.Ee – Antiferromagnetics
© EPLA, 2013
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