Strong-coupling theory for multiband superconductors

N. M. Plakida

Teoretičeskaâ i matematičeskaâ fizika, Tome 174 (2013) no. 2, pp. 313-325

Résumé

We consider a microscopic theory of the strong coupling in multiband superconductors with an arbitrary electron–boson interaction. Based on the method of the equations of motion for two-time Green's functions, we derive the Dyson equation with the self-energy operator in the form of the multiparticle Green's function taking the interaction of electrons with phonons and spin fluctuations into account. We obtain a self-consistent system of equations for the normal and anomalous components of the Green's function and the self-energy operator calculated in the approximation of noncrossing diagrams. We discuss the approximate solution of the system of equations taking only components of the self-energy operator that are diagonal with respect to the band index into account for studying superconductivity in iron-based compounds.

Détail

Keywords: superconductivity theory, strong-coupling approximation, multiband superconductor, two-time Green's function.

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