Strong Intramolecular Electron-Phonon Coupling in the Negatively Charged Aromatic Superconductor Picene
Takashi Kato, Takashi Kambe, Yoshihiro Kubozono
DOI 10.1103/PhysRevLett.107.077001 · Physical Review Letters
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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 (eV molecule spin) 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 (eV molecule spin) determined experimentally for K322ph with Tc=18 K, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K3picene Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
| K3picene Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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