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APS » Journals » Phys. Rev. B » Volume 75 » Issue 19
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Phys. Rev. B 75, 195432 (2007) [7 pages]

Bulk electronic structure of K3C60 as revealed by soft x-rays

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Tanel Käämbre1,*, Joachim Schiessling1,†, Lisbeth Kjeldgaard1, Limin Qian1, Ingrid Marenne2, James N. O’Shea1,‡, Joachim Schnadt1,§, Dennis Nordlund1, Chris J. Glover3,**, Jan-Erik Rubensson1, Petra Rudolf2,††, Nils Mårtensson1,3, Joseph Nordgren1, and Paul A. Brühwiler1,4,‡‡
1Department of Physics, Uppsala University, P.O. Box 530, S-75121 Uppsala, Sweden
2LISE, Facultés Universitaires Notre Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
3MAX-lab, Lund University, P.O. Box 118, S-22100 Lund, Sweden
4Empa, Swiss Federal Laboratories for Materials Testing and Research, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland

Received 23 December 2006; revised 3 March 2007; published 22 May 2007

We present C 1s x-ray absorption, x-ray emission, and resonant inelastic x-ray scattering (RIXS) spectra of single-phase crystalline K3C60. The comparison to valence-band photoelectron spectra from the same sample facilitates identification of the contribution from surface and bulk electronic states in the latter. Bulk-sensitive techniques show that the valence bands of K3C60 and pure C60 are characterized by spectral features of similar width, in agreement with the predictions of band-structure calculations. Symmetry selectivity in the RIXS process allows us to assign peaks in the C 1s absorption spectrum, demonstrating a close correspondence with pure C60 also in the conduction band. The symmetry selectivity is as pronounced in K3C60 as in pure C60, indicating that the local C60 symmetry is not appreciably affected by the K doping, either in the ground state or intermediate state, on the time scale of 6 fs.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.195432
DOI:
10.1103/PhysRevB.75.195432
PACS:
78.40.Ri, 73.20.At, 78.70.En, 79.60.−i

*Present address: Institute of Physics, Tartu University, Riia 142, EE-51014 Tartu, Estonia. Electronic address: tanel@fi.tartu.ee

†Present address: MAX-lab, Lund University, P.O. Box 118, S-22100 Lund, Sweden. Electronic address: joachim.schiessling@maxlab.lu.se

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

§Present address: Department of Synchrotron Radiation Research, Lund University, P.O. Box 118, S-22100 Lund, Sweden.

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

††Present address: Materials Science Centre, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.

‡‡Electronic address: paul.bruehwiler@empa.ch

 
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