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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/ |
| Appears in Collections: | Journal/Magazine Article |
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|---|---|---|---|---|
| Mulders_Charge_Orbital_Glass.pdf | 342.17 kB | Adobe PDF | View/Open |
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