Abstract
We have performed extended x-ray absorption fine-structure (EXAFS) spectroscopy on a 2.8% Cr-dopedV2O3 sample, with the aim of studying its structural evolution in a wide temperaturerange across the paramagnetic–antiferromagnetic insulating phase transition atTc. The data were registered with two different set-ups in fluorescence and transmission geometries,for polarized and unpolarized spectra, respectively. Our idea, based on previous experimentsreported in the literature, is that extended structural modifications of the nominal trigonalsymmetry are present in the paramagnetic insulating phase for several tens of degrees aboveTc, involving further-nearest-neighbor vanadium ions. Our data confirm that the paramagneticinsulating phase is not structurally homogeneous in a temperature range of about 30 K aroundTc, where local distortions of monoclinic symmetry involving further-nearest neighbors arepresent. Moreover, the analysis of the absorption profile at Cr K-edge suggests that Cr ionsenter the lattice randomly. We finally analyze our findings in light of current theoreticalmodels.
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