Intercalant and Intermolecular Phonon Assisted Superconductivity in K-Doped Picene
Michele Casula, Matteo Calandra, Gianni Profeta, Francesco Mauri
DOI 10.1103/PhysRevLett.107.137006 · Physical Review Letters
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Abstract
K3 picene is a superconducting molecular crystal with a critical temperature of Tc=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 λ=0.73 and ωlog=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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K3C22H14 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| K3C22H14 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| K3C22H14 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
| Cs3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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