A metallic system without any further doping was obtained combining, in a bulk film, heterojunctions made by subsequent depositions of C60 and picene layers on Ag(111). This is caused by the formed dipole between the two molecules due to the huge difference in electron affinities and the charge transfer from the substrate. The above situation and the expected molecular geometry have also a role when the heterojunction film is doped with potassium. C60 phases diverse from those observed in bulk C60, especially, a metallic state with continuous alkali doping of the LUMO bands was found. This opens the way towards novel bulk molecular heterojunction structures that may create new electronic phases in strongly correlated molecular materials. The present case appears as the only manner known so far to form a bulk metallic KxC60 system (0<x<6) that may evoke the possibility of seeing the awaited dome-shaped region of the doping-temperature phase diagram if the system should show superconductivity.

Metallic picene/C60 heterojunctions and the effect of potassium doping / M. Caputo, M. Panighel, L. Petaccia, C. Struzzi, V. Alijani, M. Coreno, M. de Simone, G. Fratesi, G. Di Santo, A. Goldoni. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 90:20(2014), pp. 201401.1-201401.5. [10.1103/PhysRevB.90.201401]

Metallic picene/C60 heterojunctions and the effect of potassium doping

G. Fratesi;
2014

Abstract

A metallic system without any further doping was obtained combining, in a bulk film, heterojunctions made by subsequent depositions of C60 and picene layers on Ag(111). This is caused by the formed dipole between the two molecules due to the huge difference in electron affinities and the charge transfer from the substrate. The above situation and the expected molecular geometry have also a role when the heterojunction film is doped with potassium. C60 phases diverse from those observed in bulk C60, especially, a metallic state with continuous alkali doping of the LUMO bands was found. This opens the way towards novel bulk molecular heterojunction structures that may create new electronic phases in strongly correlated molecular materials. The present case appears as the only manner known so far to form a bulk metallic KxC60 system (0
Settore FIS/03 - Fisica della Materia
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/245355
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact