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Phys. Rev. B 71, 165420 (2005) [16 pages]

Bulk and surface charge states of K3C60

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J. Schiessling1,*, L. Kjeldgaard1,†, T. Käämbre1,‡, I. Marenne2, J. N. O’Shea1,§, J. Schnadt1,**, C. J. Glover3,††, M. Nagasono3,‡‡, D. Nordlund3, M. G. Garnier3,a, L. Qian1, J.-E. Rubensson1, P. Rudolf2,4, N. Mårtensson1,3, J. Nordgren1, and P. A. Brühwiler1,5,b
1Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
2LISE, Facultès Universitaires Notre Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
3MAX-lab, University of Lund, Box 118, SE-221 00 Lund, Sweden
4Materials Science Centre, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands
5EMPA, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland

Received 3 July 2004; revised 11 November 2004; published 18 April 2005

We detect a significant angle-dependence in the core level and valence line shapes of photoelectron spectra of single crystal K3C60. This allows the identification of bulk and surface components in the data, and allows us to explain the anomalous line shapes observed for this system. The states near the Fermi level are associated with the bulk of the sample. There is strong evidence of an insulating surface layer, which we ascribe to intermolecular electron correlations. These results simplify the interpretation of previous, apparently conflicting observations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.165420
DOI:
10.1103/PhysRevB.71.165420
PACS:
79.60.Bm, 71.20.Tx, 71.27.+a

*Electronic address: joachim.schiessling@fysik.uu.se

†Present address: MAX-lab, University of Lund, Box 118, SE-221 00 Lund, Sweden.

‡Present address: Institute of Physics, Tartu University, Riia 142, EE-51014 Tartu, Estonia.

§Present address: School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.

**Present address: Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, 8000 Aarhus C, Denmark.

††Present address: Department of Electronic Materials Engineering, Research School of Physical Sciences and Engineering, Australian National University Canberra, Australia.

‡‡Present address: Process Chemical Physics, Department of Materials Science and Engineering, Kyoto University, Skyo-ku, Kyoto 606-8501, Japan.

aPresent address: Institut de physique, Université de Neuchâtel rue Breguet 1, CH-2000 Neuchâtel, Switzerland.

bElectronic address: paul.bruehwiler@empa.ch

 
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