Quantum criticality and superconducting pairing in Ce1-xYbxCoIn5 alloys

International Conference on Strongly Correlated Electron Systems 2014

Singh, Y.P.^1 ; Haney, D.J.^1 ; Lum, I.K.^2 ; White, B.D.^2 ; Maple, M.B.^2 ; Dzero, M.^1 ; Almasan, C.C.^1

Department of Physics, Kent State University, Kent

OH

44242, United States^1

Department of Physics, University of California at San Diego, San Diego

CA

92903, United States^2

关键词: Pairing mechanism;    Pressure dependence;    Quantum critical points;    Quantum criticality;    Single crystalline alloys;    Superconducting pairing;    Temperature and pressures;    Transport measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012078/pdf
DOI  :  10.1088/1742-6596/592/1/012078

来源: IOP

【 摘 要 】

Charge transport measurements under magnetic field and pressure on Ce1-xYbxCoIn5single 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 Tcand Tcohincrease 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 Tcohand Tcwithin the composite pairing theory. In the purely static limit, we find that the composite pairing mechanism necessarily causes opposite behaviors of Tcohand Tcwith pressure: if Tcoh grows with pressure, Tcmust decrease with pressure and vice versa.