Wilson ratio in Yb-substituted CeCoIn5

Abstract

We have investigated the effect of Yb substitution on the Pauli limited, heavy fermion superconductor, CeCoIn${}_5$. Yb acts as a non-magnetic divalent substituent for Ce throughout the entire doping range, equivalent to hole doping on the rare earth site. We found that the upper critical field in (Ce,Yb)CoIn${}_5$ is Pauli limited, yet the reduced (H,T) phase diagram is insensitive to disorder, as expected in the purely orbitally limited case. We use the Pauli limiting field, the superconducting condensation energy and the electronic specific heat coefficient to determine the Wilson ratio ($R_W$), the ratio of the specific heat coefficient to the Pauli susceptibility in CeCoIn${}_5$. The method is applicable to any Pauli limited superconductor in the clean limit.

5 pages, 1 table, 4 figures

References in corpus (7)

• Spin resonance in the d-wave superconductor CeCoIn5
• Microscopic evidence for field-induced magnetism in CeCoIn${}_5$
• Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn_5
• Heavy electrons and the symplectic symmetry of spin
• Supplementary material to Heavy electrons and the symplectic symmetry of spin
• Nodal structure of quasi-2D superconductors probed by magnetic field
• Wilson ratio in Yb-substituted CeCoIn5

Cited by in corpus (9)

• Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion superconductor CeCoIn5
• Evolution of the superconducting energy gap structure concomitant with Fermi surface reconstruction in the heavy-fermion superconductor CeCoIn5
• Yb Valence Change in (Ce,Yb)CoIn5 from spectroscopy and bulk properties
• Strong suppression of superconductivity by divalent Ytterbium Kondo-holes in CeCoIn_5
• Wilson ratio in Yb-substituted CeCoIn5
• Resolution of the discrepancy between the variation of the physical properties of Ce1-xYbxCoIn5 single crystals and thin films with Yb composition
• From local moment to mixed-valence regime in Ce(1-x)Yb(x)CoIn5 alloys
• Symplectic large-N theory of topological heavy-fermion semiconductors
• Correlated disorder in Kondo lattice