Renormalizations In Unconventional Superconducting States Of Ce1-Xybxcoin5

We have measured the superconducting penetration depth Lambda(T) in the heavy-fermion/intermediate-valent superconducting alloy series Ce1-xYbxCoIn5 using a transverse-field muon spin relaxation to study the effect of intermediate-valent Yb doping on Fermi-liquid renormalization. From Lambda(T) we determine the superfluid density rho(s)(T) and find that it decreases continuously with increasing nominal Yb concentration x, i.e., with increasing intermediate valence. The temperature-dependent renormalization of the "normal" fluid density rho(N)(T)= rho(s)(0) - rho(s)(T) in both the heavy-fermion and intermediate valence limits is proportional to the temperature-dependent renormalization of the specific heat. This indicates that the temperature-dependent Fermi-liquid Landau parameters of the superconducting quasiparticles entering the two different physical quantities are the same. These results represent an important advance in understanding of both intermediate valence and heavy-fermion phenomena in superconductors.