Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-11-17
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, RevTex, 4 figures included in the text, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.15472
Electron-phonon and electron-electron interactions are in competition in determining the properties of molecular charge transfer conductors and superconductors. The direct influence of phonons on the electron-electron interaction was not before considered and in the present work the coupling of intramolecular modes to electron-electron interaction (U-vib interaction) is investigated.The effect of this coupling on the frequency of the normal modes of a dimer model is obtained and it is shown that frequency shifts of the Raman active modes are directly related to this coupling. The results are used to obtain the values of the U-vib coupling constants of intramolecular modes of a representative molecule of charge transfer conductors, like tetramethyltetratiafulvalene. Consequences of this coupling on the electron pairing are also suggested.
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