Reversible phase transformation and doubly-charged anions at the surface of simple cubic RbC60

Details Reversible phase transformation and doubly-charged anions at the surface of simple cubic RbC60 Reversible phase transformation and doubly-charged anions at the surface of simple cubic RbC60

2008-10-27

arxiv.org/abs/0810.4818v1

Physics

Condensed Matter

Materials Science

13 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.236403

The simple cubic phase of a RbC60 thin film has been studied using photoelectron spectroscopy. The simple cubic-to-dimer transition is found to be reversible at the film surface. A sharp Fermi edge is observed and a lower limit of 0.5 eV is found for the surface Hubbard U, pointing to a strongly-correlated metallic character of thin-film simple cubic RbC60. A molecular charge state is identified in the valence band and core level photoemission spectra which arises from C602- anions and contributes to the spectral intensity at the Fermi level.

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