Electron-phonon interactions, pair-transfer processes, and superconductivity in TTF[Ni(dmit)2]2
R. Ramakumar, Y. Tanaka, K. Yamaji
DOI 10.1103/PhysRevB.56.795 · Physical Review B
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Abstract
A model is developed for superconductivity in TTF[Ni(dmit)2]2. We include both electron-intramolecular and -intermolecular vibration couplings. These interactions are the principal sources of superconducting pairing. The electron-intramolecular vibration coupling constants are estimated after performing a complete normal-mode analysis. The electron-intermolecular vibration coupling constants are also estimated. The unique band structure of this material [with both highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) derived bands crossing the Fermi level] leads to a pair-transfer term between the bands. Estimates for Tc are in reasonable agreement with experimental results. We find that major contribution to the electron-phonon interaction, in this material, comes to the LUMO band from acoustic phonons and pair transfer processes reduce the effects of the intraband Coulomb repulsion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TTF[Ni(dmit)2]2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.6 | 0.7 GPa | unknown |
| TTF[Pd(dmit)2]2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | 2 GPa | unknown |
| (CH3)4N[Ni(dmit)2]2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | 0.7 GPa | unknown |
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