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

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Craciun, Monica F. and Giovannetti, Gianluca and Rogge, Sven and Brocks, Geert and Morpurgo, Alberto F. and Brink, Jeroen van den (2009) Evidence for the formation of a Mott state in potassium-intercalated pentacene. Physical Review B: Condensed matter and materials physics, 79 (15). p. 155116. ISSN 1098-0121

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Abstract: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.
Item Type:Article
Copyright:© 2009 American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/61351
Official URL:http://dx.doi.org/10.1103/PhysRevB.79.125116
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