Eur. Phys. J. B 41, 435-438 (2004)
https://doi.org/10.1140/epjb/e2004-00335-2

Insulating surface layer on single crystal K₃C₆₀

¹ Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden
² Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
³ LISE, Facultés Universitaires Notre Dame de la Paix, Rue de Bruxelles 61, 5000 Namur, Belgium
⁴ MAX-lab, University of Lund, Box 118, 22100 Lund, Sweden
⁵ EMPA, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland

Corresponding authors: ^a joachim.schiessling@fysik.uu.se - ^b paul.bruehwiler@empa.ch

Received: 16 July 2004
Published online: 5 November 2004

Abstract

Using angle-dependent photoemission spectra of core and valence levels we show that metallic, single crystal is terminated by an insulating or weakly-conducting surface layer. We attribute this to the effects of strong intermolecular correlations combined with the average surface charge state. Several controversies on the electronic structure are thereby resolved.