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

M. F. Craciun; G. Giovannetti; S. Rogge; G. Brocks; A. F. Morpurgo; J. van den Brink

doi:10.1103/PhysRevB.79.125116

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

Strongly Correlated Electrons 2009-03-31 v2 Materials Science

Authors: M. F. Craciun , G. Giovannetti , S. Rogge , G. Brocks , A. F. Morpurgo , J. van den Brink

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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.

Keywords

potassium-intercalated pentacene mott metal-insulator transition electronic transport temperature-dependent conductivity electron-electron interactions electronic structure calculations

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@article{arxiv.0802.2813,
  title  = {Evidence for the formation of a Mott state in potassium-intercalated pentacene},
  author = {M. F. Craciun and G. Giovannetti and S. Rogge and G. Brocks and A. F. Morpurgo and J. van den Brink},
  journal= {arXiv preprint arXiv:0802.2813},
  year   = {2009}
}

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8 pages, 6 figures

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

Abstract

Keywords

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