Structural dichroism in the antiferromagnetic insulating phase of V_2O_3

Details Structural dichroism in the antiferromagnetic insulating phase of V_2O_3 Structural dichroism in the antiferromagnetic insulating phase of V_2O_3

2005-06-17

arxiv.org/abs/cond-mat/0506432v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 3 figures. To be published in Phys. Rev. B (2005)

Scientific paper

10.1103/PhysRevB.72.033111

We performed near-edge x-ray absorption spectroscopy (XANES) at V K edge in the antiferromagnetic insulating (AFI) phase of a 2.8% Cr-doped V_2O_3 single crystal. Linear dichroism of several percent is measured in the hexagonal plane and found to be in good agreement with ab-initio calculations based on multiple scattering theory. This experiment definitively proves the structural origin of the signal and therefore solves a controversy raised by previous interpretations of the same dichroism as non-reciprocal. It also calls for a further investigation of the role of the magnetoelectric annealing procedure in cooling to the AFI phase.

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