Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-02-24
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 6 figures, accepted to PRB
Scientific paper
10.1103/PhysRevB.65.165107
We demonstrate that angle-resolved soft x-ray spectroscopy can resolve absorption by inequivalent oxygen sites and by different orbitals belonging to the same site in NaV2O5. By rotating the polarization direction, we see a dramatic change in the absorption spectra at the oxygen K edge. Our theory identifies the detailed composition of the spectra and predicts a correct energy-ordering of the orbitals of three inequivalent oxygen atoms. Because different orbitals dominate absorption spectra at different energies and angles, one can excite at a specific site and ``orbital''. In contrast, absorption at the vanadium L edge does not show large changes when varying the polarization direction. The reason for this is that different excitation channels (involving different initial states for the excited electron) overlap in energy and vary in compensating ways, obscuring each channel's sensitive polarization dependence.
Callcott T. A.
Chang Gue Su
He Jingsong
Lin Lin
Mandrus David
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