Surface Hubbard U of alkalifullerides (Articolo in rivista)

Type
Label
  • Surface Hubbard U of alkalifullerides (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.elspec.2010.07.006 (literal)
Alternative label
  • Roberto Macovez; Michael R.C. Hun; Andrea Goldoni; Maddalena Pedio; Petra Rudolf (2011)
    Surface Hubbard U of alkalifullerides
    in Journal of electron spectroscopy and related phenomena (Print); Elsevier BV, Amsterdam (Paesi Bassi)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Roberto Macovez; Michael R.C. Hun; Andrea Goldoni; Maddalena Pedio; Petra Rudolf (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 10 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • R. Macovez, P. Rudolf Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands M. Hunt Department of Physics, University of Durham, Durham DH1 3LE, UK A. Goldoni Sincrotrone Trieste, s.s. 14 km 163.5, Area Science Park, I-34012 Trieste, Italy M. Pedio Laboratorio Nazionale TASC-INFM, s.s. 14 km 163.5, Area Science Park, I-34012 Trieste, Italy and ISM-CNR (sede Trieste), s.s. 14 km 163.5, Area Science Park, I-34012 Trieste, Italy (literal)
Titolo
  • Surface Hubbard U of alkalifullerides (literal)
Abstract
  • We report a combined photoemission spectroscopy (PES) and inverse photoemission spectroscopy (IPES) study of distilled, phase pure films of C(60) and the monomeric fullerides Cs(6)C(60), Cs(4)C(60) and fcc RbC(60). The separation between the highest energy PES and lowest energy IPES features, which is a measure of the barrier to hopping, is 1.45 eV in Cs(4)C(60) and 0.7 eV in RbC(60). This difference is large enough to explain, in a correlated electron picture, the reported differences in electronic mobility between the two stoichoimetries. From the PES-IPES energy separation, the value of the Hubbard U is estimated to be 1.5 eV in closed-shell C(60) and Cs(6)C(60), while in Cs(4)C(60) and RbC(60) such value is reduced to similar to 1 and 0.7 eV, respectively. This trend can be only partially understood taking into account the different molecular polarizability and crystal structure of the various stoichiometries. The relatively low values found for open-shell compounds indicate that the bulk Hubbard U is smaller in open-shell fullerides than usually believed, which might help explain superconductivity and the observation of spin-singlets in odd-stoichiometry fullerides. (literal)
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