Volume 107, Number 4, August 2014
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 August 2014|
Determination of the charge-ordered phases in LuFe2O4
1 ESRF-The European Synchrotron, CS40220 - F-38043 Grenoble Cedex 9, France
2 Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC- Universidad de Zaragoza, Departamento de Física de la Materia Condensada - Pedro Cerbuna 12, 50009 Zaragoza, Spain
3 Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus - Didcot, Oxfordshire OX11 0DE, UK
4 Laboratory for Developments and Methods, Paul Scherrer Institut - 5232 Villigen PSI, Switzerland
Received: 15 May 2014
Accepted: 19 July 2014
High-resolution synchrotron powder diffraction and Fe K-edge x-ray resonant scattering (RXS) have been combined to determine both the magnitude and sequence of the Fe charge segregation in LuFe2O4. Two phases with different charge disproportionation were found below the so-called charge ordering transition temperature . The crystal structure between 320 K and 200 K shows a symmetry where four non-equivalent iron sites with different valences were determined (, , and ). Below 200 K the structure further changes to the symmetry and six crystallographic sites for the iron atoms were found. The simplest valence distribution corresponds to a tri-modal one, where the six Fe atoms are grouped in couples with three valences , and . Both polar and anti-polar charge sequences have been discarded.
PACS: 75.25.Dk – Orbital, charge, and other orders, including coupling of these orders / 75.47.Lx – Magnetic oxides / 61.05.C- – X-ray diffraction and scattering
© EPLA, 2014
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