Behavior of uranium 5f states in a graphite intercalation compound
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Contributors
Abstract
We present an angle-resolved photoemission (PE) and angle-resolved resonant PE study of a single crystalline U-graphite intercalation compound (U-GIC). Stage-2 U-GIC samples were prepared in situ, by deposition of U metal onto clean graphite (0001) substrates and subsequent annealing. As follows from comparison with the results of local-density approximation (LDA)-linear combination of atomic orbitals (LCAO) band-structure calculations, the electronic structure of the grown GIC may be understood by the filling of unoccupied graphite pi*(0) bands by additional electrons contributed by U. This charge transfer is monitored by a shift to higher binding energies of all graphite-derived PE features and the appearance of an additional rather narrow feature at the Fermi energy (E-F), upon intercalation. This Fermi-level peak is superimposed by a sharp U 5f signal, that is located directly at EF and reveals no trace of multiplet splitting or dispersion. Results of band-structure calculations indicate a weak hybridization of the U 5f states and their occupation of about 2. A description of the observed 5f-related spectra in the framework of a single-impurity Anderson model is possible.
Details
Original language | English |
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Article number | 035404 |
Number of pages | 8 |
Journal | Physical Review B |
Volume | 64 |
Issue number | 3 |
Publication status | Published - 15 Jul 2001 |
Peer-reviewed | Yes |
External IDs
Scopus | 85038331922 |
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Keywords
Keywords
- Angle-resolved photoemission, Single-crystal graphite, Electronic-structure, Synchrotron-radiation, Resonant photoemission, Band, Metal, Spectroscopy, Excitation, System