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Article Dans Une Revue Physical Review Letters Année : 2011

Intercalant and Intermolecular Phonon Assisted Superconductivity in K-Doped Picene

Résumé

K3 picene is a superconducting molecular crystal with a critical temperature of Tc ¼ 7 or 18 K, depending on the preparation conditions. Using density functional theory we show that electron-phonon interaction accounts for Tc 3-8 K. The average electron-phonon coupling, calculated by including the phonon energy scale in the electron-phonon scattering, is ! ¼ 0:73 and !log ¼ 18:0 meV. Intercalant and intermolecular phonon modes contribute substantially (40%) to ! 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.

Dates et versions

hal-00651415 , version 1 (13-12-2011)

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Citer

Michele Casula, Matteo Calandra, Gianni Profeta, Francesco Mauri. Intercalant and Intermolecular Phonon Assisted Superconductivity in K-Doped Picene. Physical Review Letters, 2011, 107, pp.137006. ⟨10.1103/PhysRevLett.107.137006⟩. ⟨hal-00651415⟩
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