Evidence for the formation of a Mott state in potassium-intercalated pentacene

M.F. Craciun, Monica F. Craciun, G. Giovannetti, Sven Rogge, G. Brocks, Alberto F. Morpurgo, J. van den Brink

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We investigate electronic transport through pentacene thin films intercalated with potassium. From temperature-dependent conductivity measurements we find that potassium-intercalated pentacene shows metallic behavior in a broad range of potassium concentrations. Surprisingly, the conductivity exhibits a re-entrance into an insulating state when the potassium concentration is increased past one atom per molecule. We analyze our observations theoretically by means of electronic structure calculations, and we conclude that the phenomenon originates from a Mott metal-insulator transition, driven by electron-electron interactions.
Original languageUndefined
Pages (from-to)125116/1-125116/8
Number of pages8
JournalPhysical review B: Condensed matter and materials physics
Issue number15
Publication statusPublished - 2009


  • metal-insulator transition
  • Organic semiconductors
  • Organic compounds
  • Thin Films
  • potassium compounds
  • Electrical conductivity
  • intercalation compounds
  • IR-61351
  • METIS-256590

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