Abstract
Charge transport measurements under magnetic field and pressure on Ce1-xYbxCoIn5 single crystalline alloys revealed that: (i) relatively small Yb substitution suppresses the field induced quantum critical point, with a complete suppression for Yb doping x > 0.07; (ii) the superconducting transition temperature (Tc) and Kondo lattice coherence temperature (Tcoh) decrease with x, yet they remain finite over the wide range of Yb concentrations; (iii) both Tc and Tcoh increase with pressure; (iv) there are two contributions to resistivity, which show different temperature and pressure dependences, implying that both heavy and light quasiparticles contribute to inelastic scattering. We also analyzed the pressure dependence of both Tcoh and Tc within the composite pairing theory. In the purely static limit, we find that the composite pairing mechanism necessarily causes opposite behaviors of Tcoh and Tc with pressure: if Tcoh grows with pressure, Tc must decrease with pressure and vice versa.
Highlights
Most of the current research efforts in unconventional superconductors are primarily focused on the understanding of their normal state properties, possible symmetries of the superconducting order parameter, as well as the microscopic mechanism of Cooper pairing
It is believed that superconductivity with s-wave symmetry of the order parameter is often realized in materials where electron-electron correlations are weak
We present a theoretical study of the pressure dependence of the Kondo lattice coherence and superconducting critical temperatures within the frame of the composite pairing theory
Summary
Most of the current research efforts in unconventional superconductors are primarily focused on the understanding of their normal state properties, possible symmetries of the superconducting order parameter, as well as the microscopic mechanism of Cooper pairing. The resistivity of Ce1−xYbxCoIn5 (0.00 ≤ x ≤ 0.75) alloys exhibits properties typical of heavy fermion systems [11, 12, 13], but our detailed analysis of charge transport measurements in the presence of magnetic field and hydrostatic pressure have revealed many interesting and unusual features that emerge with Yb doping. These results allowed us to extract information about the evolution of the magnetic-field-tuned QCP present in CeCoIn5 [14] with Yb doping and about the nature of the superconducting pairing.
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