BEDT-TTF organic superconductors: The role of phonons
Alberto Girlando, Matteo Masino, Aldo Brillante, Raffaele G. Della Valle, Elisabetta Venuti
DOI 10.1103/PhysRevB.66.100507 · Physical Review B
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Abstract
We calculate the lattice phonons and the electron-phonon coupling of the organic superconductor κ−(BEDT−TTF)2I3, reproducing all available experimental data connected to phonon dynamics. Low-frequency intramolecular vibrations are strongly mixed to lattice phonons (LP). Both acoustic and optical phonons are appreciably coupled to electrons through the modulation of the hopping integrals (e-LP coupling). By comparing the results relevant to superconducting κ- and β*−(BEDT−TTF)2I3, we show that electron-phonon coupling is fundamental to the pairing mechanism. Both e-LP and electron–molecular vibration (e-MV) couplings are essential to reproduce the critical temperatures. The e-LP coupling is stronger, but e−MV is instrumental in increasing the average phonon frequency.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | Pressure not reported | unknown |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure not reported | unknown |
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