Behavior of uranium 5f states in a graphite intercalation compound

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • S Danzenbächer - , Chair of Surface Physics (Author)
  • SL Molodtsov - , TUD Dresden University of Technology (Author)
  • J Boysen - , TUD Dresden University of Technology (Author)
  • C Laubschat - , Chair of Surface Physics (Author)
  • AM Shikin - , St. Petersburg State University (Author)
  • SA Gorovikov - , St. Petersburg State University (Author)
  • M Richter - , Leibniz Institute for Solid State and Materials Research Dresden (Author)

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 languageEnglish
Article number035404
Number of pages8
JournalPhysical Review B
Volume64
Issue number3
Publication statusPublished - 15 Jul 2001
Peer-reviewedYes

External IDs

Scopus 85038331922

Keywords

Keywords

  • Angle-resolved photoemission, Single-crystal graphite, Electronic-structure, Synchrotron-radiation, Resonant photoemission, Band, Metal, Spectroscopy, Excitation, System