Abstract
We study the Kondo lattice model with an additional Einstein phonon mode coupled via a Holstein term to the electrons within the dynamical mean-field theory at T = 0. Asimpurity solver we use the numerical renormalization group. We present results for the paramagnetic case showing the anticipated heavy Fermion physics, including direct evidence for the appearance of a large Fermi surface for antiferromagnetic exchange interaction.By introducing a Nambu notation, we find that increasing electron-phonon coupling favorssuperconductivity, which however is not BCS like but shows additional structures in the density of states and the gap function.
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Bodensiek, O., Žitko, R., Peters, R., Pruschke, T. (2011). Heavy Fermions and Superconductivity in the Kondo-Lattice Model with Phonons. In: Bonca, J., Kruchinin, S. (eds) Physical Properties of Nanosystems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0044-4_19
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DOI: https://doi.org/10.1007/978-94-007-0044-4_19
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