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TMF, 2013, Volume 174, Number 2, Pages 313–325 (Mi tmf8407)  

Strong-coupling theory for multiband superconductors

N. M. Plakida

Joint Institute for Nuclear Research, Dubna, Moscow Oblast, Russia

Abstract: 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.

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

DOI: https://doi.org/10.4213/tmf8407

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English version:
Theoretical and Mathematical Physics, 2013, 174:2, 273–283

Bibliographic databases:

Document Type: Article
Received: 29.08.2012

Citation: N. M. Plakida, “Strong-coupling theory for multiband superconductors”, TMF, 174:2 (2013), 313–325; Theoret. and Math. Phys., 174:2 (2013), 273–283

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  • Теоретическая и математическая физика Theoretical and Mathematical Physics
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