Metal-to-insulator transition in thin-film polymeric AC(60)
| Autor: | L. Venema, Thomas Pichler, Maddalena Pedio, Michael R. C. Hunt, Joachim Schiessling, Carla Castellarin-Cudia, Junjun Shan, Paolo Moras, Andrea Goldoni, Petra Rudolf, Roberto Macovez |
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| Přispěvatelé: | Surfaces and Thin Films, Zernike Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Physics
FULLERENE CHAINS Phase transition CHAIN ORIENTATIONS Condensed matter physics Electronic correlation Transition temperature BAND-STRUCTURE General Physics and Astronomy Electronic structure PHOTOPOLYMERIZED C-60 Electron spectroscopy KC60 ELECTRONIC-STRUCTURE RBC60 HIGH-PRESSURE PHASE-TRANSITION SOLID C-60 Thin film Electronic band structure Spectroscopy |
| Zdroj: | New Journal of Physics, 11(2):023035. IOP PUBLISHING LTD New journal of physics, 2009, Vol.11(2), pp.023035 [Peer Reviewed Journal] New journal of physics 11 (2009): 023035. doi:10.1088/1367-2630/11/2/023035 info:cnr-pdr/source/autori:Macovez R., Hunt M.R.C., Shan J., Goldoni A., Pichler T., Pedio M., Moras P., Castellarin-Cudia C., Schiessling J., Venema L., Rudolf P./titolo:Metal-to-insulator transition in thin-film polymeric AC60/doi:10.1088%2F1367-2630%2F11%2F2%2F023035/rivista:New journal of physics/anno:2009/pagina_da:023035/pagina_a:/intervallo_pagine:023035/volume:11 |
| ISSN: | 1367-2630 |
| DOI: | 10.1088/1367-2630/11/2/023035 |
| Popis: | We present an electron spectroscopy study of phase-pure AC(60) 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 C-60, the occupied electronic states of AC(60) fullerides are not dramatically affected by polymerization. The energy separation between the leading feature in photoemission and inverse photoemission is similar in both stable AC(60) 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. |
| Databáze: | OpenAIRE |
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