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Insulating surface layer on single crystal K $\mathsf{_{3}}\mathsf{C}\mathsf{_{60}}$

Authors:	Email author" target="_blank">J?Schiessling Email author L?Kjeldgaard T?K??mbre I?Marenne L?Qian J?N?O’Shea J?Schnadt M?G?Garnier D?Nordlund M?Nagasono C?J?Glover J-E?Rubensson N?M?rtensson P?Rudolf J?Nordgren P?A?Brühwiler

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

Abstract:	Using angle-dependent photoemission spectra of core and valence levels we show that metallic, single crystal K³C₆₀ 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.Received: 16 July 2004, Published online: 5 November 2004PACS: 71.20.Tx Fullerenes and related materials; intercalation compounds - 73.20.-r Electron states at surfaces and interfaces - 79.60.Bm Clean metal, semiconductor, and insulator surfaces

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