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Metal-to-insulator transition in thin-film polymeric AC(60).

Macovez, R. and Hunt, M.R.C. and Shan, J.J. and Goldoni, A. and Pichler, T. and Pedio, M. and Moras, P. and Castellarin-Cudia, C. and Schiessling, J. and Venema, L. and Rudolf, P. (2009) 'Metal-to-insulator transition in thin-film polymeric AC(60).', New journal of physics., 11 (2). 023035.


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.

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Publisher statement:This article is published under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA version 3.0) licence
Date accepted:No date available
Date deposited:09 August 2017
Date of first online publication:20 February 2009
Date first made open access:No date available

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