  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.
