Direct observation of charge order and orbital glass state in multiferroic LuFe2O4

Details Direct observation of charge order and orbital glass state in multiferroic LuFe2O4 Direct observation of charge order and orbital glass state in multiferroic LuFe2O4

2008-12-16

arxiv.org/abs/0812.3094v2

PRL 103 (2009) 077602.

Physics

Condensed Matter

Strongly Correlated Electrons

v2: refined analysis, added supplement, PRL, accepted for publication

Scientific paper

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+. Polarization and azimuthal angle dependence of the superlattice reflections demonstrates the absence of anisotropic scattering revealing random orientations of the Fe2+ orbitals characteristic of an orbital glass state.

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