  
|
    
|
Zeitschrift für Physik B Condensed Matter
ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)
Abstract Volume 100 Issue 3 (1996) pp 381-385
Electron-energy bands in single-crystalline La-intercalated graphite
S. L. Molodtsov (1)(4), T. Gantz (1), C. Laubschat (1), A. G. Viatkine (2)(4), J. Avila (2)(3), C. Casado (2)(3), M. C. Asensio (2)(3)
(1) Institut für Oberflächen- und Mikrostrukturphysik, TU Dresden, D-01062 Dresden, Germany
(2) L.U.R.E., Universite Paris Sud, F-91405 Orsay Cedex, France
(3) Instituto de Ciencia de Materiales de Madrid, CSICC/Serrano 144, E-28006 Madrid, Spain
(4) Institute of Physics, St. Petersburg State University, 198904 St. Petersburg, Russia
Received: 7 September 1995
Abstract. A graphite-intercalation compound (GIC) of La was prepared by a thermally induced surface reaction of a metallic La film on a graphite (0001) substrate. The LEED pattern shows a characteristic (\sqrt3×\sqrt3) R30° reconstruction pointing to the formation of LaC6. Angle-resolved photoemission combined with Fermi-surfaces mapping reveals a strongly anisotropic electronic band-structure of La-GIC. The unfolded <pi>-symmetry graphite-derived bands in the La intercalation compound may be described in good approximation within a simple rigid-band model by charge transfer from La to graphite. Despite the presence of filled La-5d states large photoemission intensities close to the Fermi level around the K-points of the nonreconstructed Brillouin zone are related to carbon-derived p<pi> *-bands, which become partly occupied in the GIC.
PACS: 79.60. · i; 68.35. · p; 68.65.+g; 71.45.Lr
Article in PDF-Format
Article in (gzipped) PS-Format
Last change: March 9, 1997
helpdesk@link.springer.de
© Springer Berlin Heidelberg 1996