Renormalizations in unconventional superconducting states of Ce1−xYbxCoIn5

Z. F. Ding; J. Zhang; C. Tan; K. Huang; Q. Y. Chen; I. Lum; O. O. Bernal; P.-C. Ho; D. E. MacLaughlin; M. B. Maple; L. Shu

doi:10.1103/PhysRevB.99.035136

Renormalizations in unconventional superconducting states of Ce1−xYbxCoIn5

Z. F. Ding, J. Zhang, C. Tan, K. Huang, Q. Y. Chen, I. Lum, O. O. Bernal, P.-C. Ho, D. E. MacLaughlin, M. B. Maple, L. Shu

DOI 10.1103/PhysRevB.99.035136 · Physical Review B

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Abstract

We have measured the superconducting penetration depth Λ(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 Λ(T) we determine the superfluid density ρs(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 ρN(T)=ρs(0)−ρs(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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.27	Pressure not reported	unknown
Ce0.95Yb0.05CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.18	Pressure not reported	unknown
Ce0.875Yb0.125CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.14	Pressure not reported	unknown
Ce0.8Yb0.2CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.9	Pressure not reported	unknown
Ce0.7Yb0.3CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.59	Pressure not reported	unknown
Ce0.6Yb0.4CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown
Ce0.5Yb0.5CoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.3	Pressure not reported	unknown