Revealing the insulating gap in α'-NaV (2)O(5) with resonant inelastic x-ray scattering.
We measured the low energy excitation spectrum of α'-NaV (2)O(5) across its charge ordering and crystallographic phase transition with resonant inelastic x-ray scattering (RIXS) at the V L(3) edge. Exploiting the polarization dependence of the RIXS signal and the high resolution of the data, we reveal the excitation across the insulating gap at 1 eV and identify the excitations from occupied 3d(xy) bonding orbitals to unoccupied bonding 3d(xy) and 3d(yz)/3d(xz) orbitals. Furthermore we observe a progressive change of the electronic structure of α'-NaV (2)O(5) induced by soft x-ray irradiation, with the appearance of features characteristic of sodium deficient Na(x)V (2)O(5) (x < 1).
IOM CNR, Laboratorio TASC, S.S. 14, km 163.5, I-34012 Trieste, Italy. bondino@iom.cnr.it
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Bondino
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Barla
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Schmitt
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Strocov
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Henry
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Sanchez