TY - JOUR
T1 - Metal-to-insulator transition in thin-film polymeric AC(60)
AU - Macovez, Roberto
AU - Hunt, Michael R C
AU - Shan, Junjun
AU - Goldoni, Andrea
AU - Pichler, Thomas
AU - Pedio, Maddalena
AU - Moras, Paolo
AU - Castellarin-Cudia, Carla
AU - Schiessling, Joachim
AU - Venema, Luc
AU - Rudolf, Petra
N1 - doi: 10.1088/1367-2630/11/2/023035
Author
Roberto Macovez 1, Michael R C Hunt 2, Junjun Shan 1,8, Andrea Goldoni 3, Thomas Pichler 4, Maddalena Pedio 5,6, Paolo Moras 6, Carla Castellarin-Cudia 3, Joachim Schiessling 7, Luc Venema 1 and Petra Rudolf 1,9
Affiliations
1 Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2 Department of Physics, University of Durham, Durham DH1 3LE, UK
3 Sincrotrone Trieste S.C.p.A., Strada Statale 14 Km 163.5, AREA Science Park, I-34012 Trieste, Italy
4 Fakultät für Physik, Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria
5 Laboratorio Nazionale TASC-INFM, Strada Statale 14 Km 163.5, AREA Science Park, I-34012 Trieste, Italy
6 Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Strada Statale 14 Km 163.5, AREA Science Park, I-34012 Trieste, Italy
7 Ångström Laboratory, Department of Physics, Uppsala University, Box 530, S-75121 Uppsala, Sweden
8 Current address: Leiden Institute of Chemistry, Gorlaeus Laboratories, PO Box 9501, 2300 RA Leiden, The Netherlands.
9 Author to whom any correspondence should be addressed.
PY - 2009
Y1 - 2009
N2 - We present an electron spectroscopy study of phase-pure AC60 thin films (A= Rb, Cs) in their monomer (face-centred cubic (fcc)) and polymer phases. A surface electronic reconstruction is observed in polymeric RbC60, analogous to that reported for the fcc phase. As for pristine C60, the occupied electronic states of AC60 fullerides are not dramatically affected by polymerization. The energy separation between the leading feature in photoemission and inverse photoemission is similar in both stable AC60 phases. These observations suggest that electron correlation effects are similar in the two phases, and that their different electronic behaviour is mainly related to the reduction of degeneracy of the polymer frontier states. Photoemission and electron-energy loss spectroscopy data show that the thin-film form of the RbC60 polymer is metallic at room temperature, and that it undergoes a metal–insulator transition at around 100 K. This transition temperature is much higher than that reported for the corresponding bulk phase and signals a poorer screening of Coulomb interactions at the film surface.
AB - We present an electron spectroscopy study of phase-pure AC60 thin films (A= Rb, Cs) in their monomer (face-centred cubic (fcc)) and polymer phases. A surface electronic reconstruction is observed in polymeric RbC60, analogous to that reported for the fcc phase. As for pristine C60, the occupied electronic states of AC60 fullerides are not dramatically affected by polymerization. The energy separation between the leading feature in photoemission and inverse photoemission is similar in both stable AC60 phases. These observations suggest that electron correlation effects are similar in the two phases, and that their different electronic behaviour is mainly related to the reduction of degeneracy of the polymer frontier states. Photoemission and electron-energy loss spectroscopy data show that the thin-film form of the RbC60 polymer is metallic at room temperature, and that it undergoes a metal–insulator transition at around 100 K. This transition temperature is much higher than that reported for the corresponding bulk phase and signals a poorer screening of Coulomb interactions at the film surface.
U2 - 10.1088/1367-2630/11/2/023035
DO - 10.1088/1367-2630/11/2/023035
M3 - Article
SN - 1367-2630
VL - 11
JO - New Journal of Physics
JF - New Journal of Physics
M1 - 023035
ER -