X-Ray Resonant Scattering as a Direct Probe of Orbital Ordering in Transition-Metal Oxides
Michele Fabrizio, Massimo Altarelli, Maurizio Benfatto
Abstract
X-ray resonant scattering at the K-edge of transition metal oxides is shown to measure the orbital order parameter, supposed to accompany magnetic ordering in some cases. Virtual transitions to the 3d-orbitals are quadrupolar in general. In cases with no inversion symmetry, such as V2O3, treated in detail here, a dipole component enhances the resonance. Hence, we argue that the detailed structure of orbital order in V2O3 is experimentally accessible.
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