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We investigate the temperature- and coupling-dependent transport throughKondo dot contacts with symmetric superconducting s-wave leads. For finitetemperature T we use a superconducting extension of a selfconsistent auxiliaryboson scheme, termed SNCA, while at T=0 a perturbative renormalization grouptreatment is applied. The finite-temperature phase diagram for the 0--pitransition of the Josephson current in the junction is established and relatedto the phase-dependent position of the subgap Kondo resonance with respect tothe Fermi energy. The conductance of the contact is evaluated in the zero-biaslimit. It approaches zero in the low-temperature regime, however, at finite Tits characteristics are changed through the coupling- and temperature-dependent0--pi transition.Comment: 12 pages, 12 figure

π junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads