Strong intramolecular electron-phonon coupling in the negatively charged aromatic superconductor picene

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Abstract

Superconductivity was recently discovered in solid potassium-intercalated picene (K322ph), in which the picene molecule becomes trianionic (22ph3-). In this Letter, we conduct a theory-based study of the superconductivity of 22ph3- within the framework of BCS theory. We estimate the density of states N(εF) on the Fermi level to be 2.2 states per (eVmoleculespin) by using the theoretical intramolecular electron-phonon coupling lx and the experimental superconducting transition temperature Tc of 18 K. The theoretical value is consistent with the 1.2 states per (eVmoleculespin) determined experimentally for K322ph with Tc=18K, indicating the validity of our theoretical treatment and the electron-phonon mechanism for superconductivity. The predicted lx, 0.206 eV, for 22ph3- is larger than any value reported for organic superconductors, so picene may have the largest lx among the superconductors reported so far.

Original languageEnglish
Article number077001
JournalPhysical Review Letters
Volume107
Issue number7
DOIs
Publication statusPublished - Aug 9 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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