Phase Separation and Charge Transfer in a K-doped C60 Monolayer on Ag(001)

Details Phase Separation and Charge Transfer in a K-doped C60 Monolayer on Ag(001) Phase Separation and Charge Transfer in a K-doped C60 Monolayer on Ag(001)

2007-10-11

arxiv.org/abs/0710.2153v2

Physics

Condensed Matter

Materials Science

15 pages, 4 figures. v2 has minor edits for clarity

Scientific paper

We have performed a scanning tunneling microscopy and spectroscopy study of potassium-doped C60 monolayers (KxC60) on Ag(001) in the regime of x ~ 1. Low temperature annealing (640 K) leads to the formation of two well-ordered KxC60 phases that exhibit differing levels of electron charge transfer. Further annealing (710 K) distills out the higher electron-doped phase from the lower electron-doped phase, leaving behind a third C60 phase completely devoid of K. Spectroscopic measurements indicate that the electron-doping level of the higher electron-doped KC60 phase is anomalously large.

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