Title

The nonmetal to metal transition with alkali doping of films of molecular icosahedra

Document Type

Article

Date of Original Version

1-3-1997

Abstract

Using photoemission, inverse photoemission, and electron energy loss spectroscopy, we have probed the changes in the electronic structure of molecularly adsorbed closo-1,2-dicarbadodecaborane (closo-C2B10H12 or orthocarborane) films as a function of Na doping. The insulator gap of this film of molecular icosahedra closes with Na doping and both new occupied and unoccupied states are introduced. The Na-doped system resembles a Mott-Hubbard insulator, even at high doping levels, and demonstrates the defining role of correlation.

Publication Title

Chemical Physics Letters

Volume

264

Issue

1-2

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