Intercalant and intermolecular phonon assisted superconductivity in K-doped picene.

نویسندگان

  • Michele Casula
  • Matteo Calandra
  • Gianni Profeta
  • Francesco Mauri
چکیده

K(3) picene is a superconducting molecular crystal with a critical temperature of T(c) = 7 or 18 K, depending on the preparation conditions. Using density functional theory we show that electron-phonon interaction accounts for T(c) 3-8 K. The average electron-phonon coupling, calculated by including the phonon energy scale in the electron-phonon scattering, is λ = 0.73 and ω(log) = 18.0 meV. Intercalant and intermolecular phonon modes contribute substantially (40%) to λ as also shown by the isotope exponents of potassium (0.19) and carbon (0.31). The relevance of these modes makes superconductivity in K-doped picene peculiar and different from that of fullerenes.

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عنوان ژورنال:
  • Physical review letters

دوره 107 13  شماره 

صفحات  -

تاریخ انتشار 2011