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|Title:||Direct observation of charge order and an orbital glass state in multiferroic LuFe₂O₄|
|Authors:||Mulders, A. M.|
Lawrence, S. M.
|Publisher:||American Physical Society|
|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.|
|Rights:||Physical Review Letters © 2009 The American Physical Society. The Journal's web site is located at http://prl.aps.org/|
|Appears in Collections:||AP Journal/Magazine Articles|
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