Quantum criticality and superconducting pairing in Ce1-xYbxCoIn5 alloys. (18th March 2015)

• Record Type: Journal Article
• Authors: Singh, Y P; Haney, D J; Lum, I K; White, B D; Maple, M B; Dzero, M; Almasan, C C
• Is Part Of: Journal of physics. Number 592 (2015)
• Page Start: 012078
• Publication Date: 2015-03-18
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/592/1/012078
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Charge transport measurements under magnetic field and pressure on Ce1- x Yb x CoIn5 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 ( T coh ) decrease with x, yet they remain finite over the wide range of Yb concentrations; (iii) both T c and T coh 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 T coh and T c within the composite pairing theory. In the purely static limit, we find that the composite pairing mechanism necessarily causes opposite behaviors of T coh and T c with pressure: if Tcoh grows with pressure, Tc must decrease with pressure and vice versa.