Interplay of Orbital Degeneracy and Superconductivity in a Molecular Conductor

Details Interplay of Orbital Degeneracy and Superconductivity in a Molecular Conductor Interplay of Orbital Degeneracy and Superconductivity in a Molecular Conductor

1995-07-25

arxiv.org/abs/cond-mat/9507109v1

Physics

Condensed Matter

11 pages, REVTEX style, 3 compressed figures added

Scientific paper

10.1103/PhysRevB.53.12086

We study electron propagation in a molecular lattice model. Each molecular site involves doubly degenerate electronic states coupled to doubly degenerate molecular vibration, leading to a so--called E-e type of Jahn-Teller Hamiltonian. For weak electron-phonon coupling and in the anti-adiabatic limit we find that the orbital degeneracy induces an intersite pairing mechanism which is absent in the standard non-degenerate polaronic model. In this limit we analyse the model in the presence of an additional on-site repulsion and we determine, within BCS mean field theory, the region of stability of superconductivity. In one dimension, where powerful analytical techniques are available, we are able to calculate the phase diagram of the model both for weak and for strong electron-phonon coupling.

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