Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4866
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Title: Direct observation of charge order and an orbital glass state in multiferroic LuFe₂O₄
Authors: Mulders, AM
Lawrence, SM
Staub, U
Garcia-Fernandez, M
Scagnoli, V
Mazzoli, C
Pomjakushina, E
Conder, K
Wang, Y 
Issue Date: 14-Aug-2009
Source: Physical review letters, 14 Aug. 2009, v. 103, no. 7, 077602, p. 1-4
Abstract: Geometrical frustration of the Fe ions in LuFe₂O₄ leads to intricate charge and magnetic order and a strong magnetoelectric coupling. Using resonant x-ray diffraction at the Fe K edge, the anomalous scattering factors of both Fe sites are deduced from the (h/3   k/3   l/2) reflections. The chemical shift between the two types of Fe ions equals 4.0(1) eV corresponding to full charge separation into Fe²⁺ and Fe³⁺. The polarization and azimuthal angle dependence of the superlattice reflections demonstrate the absence of differences in anisotropic scattering revealing random orientations of the Fe²⁺ orbitals characteristic of an orbital glass state.
Keywords: Composite micromechanics
Glass
Chemical shift
Dielectric polarisation
Frustration
Lutetium compounds
Magnetic anisotropy
Magnetic structure
Magnetoelectric effects
Multiferroics
Superlattices
Vitreous state
X-ray diffraction
Publisher: American Physical Society
Journal: Physical review letters 
ISSN: 0031-9007
EISSN: 1079-7114
DOI: 10.1103/PhysRevLett.103.077602
Rights: Physical Review Letters © 2009 The American Physical Society. The Journal's web site is located at http://prl.aps.org/
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