Reentrant $s$-wave superconductivity in the periodic Anderson model with attractive conduction band Hubbard interaction

Abstract

Spin-flip scattering from magnetic impurities has a strong pair-breaking effect in $s$-wave superconductors where increasing the concentration of impurities rapidly destroys superconductivity. For small Kondo temperature $T_K$ the destruction of superconductivity is preceded by the reentrant superconductivity at finite temperature range $T_{c2}<T<T_{c1}$, while the normal phase reappears at $T<T_{c2}\sim T_K$. Here we explore the superconducting phase in a periodic system modeled as the Anderson lattice with additional attractive on-site (Hubbard) interaction $g$ acting on the conduction band electrons. We solve the equations using dynamical mean field theory which incorporates Kondo physics, while the pairing interaction is treated on the static mean-field level. For large coupling $g$ we find reentrant superconductivity which resembles the case with diluted impurities. However, we find evidence that reentrant superconductivity is here not a consequence of many-body correlations leading to the Kondo effect, but it rather stems from a competition between the single-particle hybridization and superconducting pairing. An insight into the spectral functions with in-gap structures is obtained from an approximate noninteracting dual model whose solution interpolates between several exact limits.

10 pages

References in corpus (9)

• Quantum Monte Carlo Impurity Solver for Cluster DMFT and Electronic Structure Calculations in Adjustable Base
• Energy resolution and discretization artefacts in the numerical renormalization group
• Spectral properties of locally correlated electrons in a BCS superconductor
• Possible re-entrant superconductivity in EuFe2As2 under pressure
• Nodal/Antinodal Dichotomy and the Two Gaps of a Superconducting Doped Mott Insulator
• The doping-driven evolution of the superconducting state of a doped Mott insulator: a key for the high temperature superconductivity
• Unconventional Superconductivity from Local Spin Fluctuations in the Kondo Lattice
• Competing d-Wave and p-Wave Spin-Singlet Superconductivities in the Two-Dimensional Kondo Lattice
• d-wave superconductivity in the frustrated two-dimensional periodic Anderson model

Cited by in corpus (1)

• Evolution of the Andreev bands in the half-filled superconducting periodic Anderson model