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Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction

DOI: 10.1103/PhysRevB.81.085107 DOI Help

Authors: J. Fernández-rodríguez (ESRF) , C. Mazzoli (ESRF) , F. Fabrizi (ESRF) , S. Lovesey (Diamond Light Source) , J. A. Blanco (Universidad de Oviedo) , D. Sivia (St. John’s College, Oxford) , K. Knight (ISIS) , F. De Bergevin (ESRF) , L. Paolasini (ESRF) , V. Scagnoli (ESRF)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 81 (8) , PAGES 085107

State: Published (Approved)
Published: February 2010

Abstract: We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator vanadium sesquioxide (V2O3) by resonant x-ray Bragg diffraction at the vanadium K edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide direct experimental evidence of the ordering motif of vanadium magnetoelectric multipoles in V2O3. Experimental data (azimuthal dependence and polarization analysis) collected at space-group forbidden Bragg reflections are successfully accounted within our model in terms of vanadium magnetoelectric multipoles. We demonstrate that resonant x-ray diffraction intensities in all space-group forbidden Bragg reflections of the kind (hkl)m with odd h are produced by an E1−E2 event. The determined multipolar parameters offer a test for ab initio calculations in this material, which can lead to a deeper and more quantitative understanding of the physical properties of V2O3.

Subject Areas: Physics

Facility: ESRF