Non-Fermi liquid behavior with and without quantum criticality in Ce(1-x)Yb(x)CoIn(5)

Abstract

One of the greatest challenges to Landau's Fermi liquid theory - the standard theory of metals - is presented by complex materials with strong electronic correlations. In these materials, non-Fermi liquid transport and thermodynamic properties are often explained by the presence of a continuous quantum phase transition which happens at a quantum critical point (QCP). A QCP can be revealed by applying pressure, magnetic field, or changing the chemical composition. In the heavy-fermion compound CeCoIn${}_5$, the QCP is assumed to play a decisive role in defining the microscopic structure of both normal and superconducting states. However, the question of whether QCP must be present in the material's phase diagram to induce non-Fermi liquid behavior and trigger superconductivity remains open. Here we show that the full suppression of the field-induced QCP in CeCoIn${}_5$ by doping with Yb has surprisingly little impact on both unconventional superconductivity and non-Fermi liquid behavior. This implies that the non-Fermi liquid metallic behavior could be a new state of matter in its own right rather then a consequence of the underlying quantum phase transition.

7 pages, 5 figures

References in corpus (9)

• Supplementary material to Heavy electrons and the symplectic symmetry of spin
• Heavy electrons and the symplectic symmetry of spin
• Incoherent non-Fermi liquid scattering in a Kondo lattice
• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5
• Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy
• Electronic inhomogeneity in a Kondo lattice
• Strong magnetic fluctuations in superconducting state of CeCoIn${}_5$
• Evolution of the Kondo state of YbRh2Si2 probed by high field ESR
• Correlated disorder in Kondo lattice

Cited by in corpus (15)

• Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with suppressed superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Evolution of the superconducting energy gap structure concomitant with Fermi surface reconstruction in the heavy-fermion superconductor CeCoIn5
• Two types of superconducting domes in unconventional superconductors
• Molecular Pairing and Fully-Gapped Superconductivity in Yb doped 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
• Correlation between non-Fermi-liquid behavior and superconductivity in (Ca, La)(Fe,Co)As2 iron arsenides: A high-pressure study
• Universal Heat Conduction in Ce1-xYbxCoIn5: Evidence for Robust Nodal d-wave Superconducting Gap
• Quantum criticality in Ce${}_{1-x}$Sm${}_x$CoIn${}_5$
• Renormalizations in unconventional superconducting states of Ce${}_{1-x}$Yb${}_x$CoIn${}_5$
• Novel attractive pairing interaction in strongly correlated superconductors
• Quantum criticality and superconducting pairing in Ce(1-x)Yb(x)CoIn5 alloys
• Zero-Field Quantum Critical Point in Ce${}_{0.91}$Yb${}_{0.09}$CoIn${}_5$
• Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5
• Quantum phase transitions and superconductivity in the pressurized heavy-fermion compound CeCuP2