Non-Fermi liquid normal state of the Heavy Fermion superconductor UBe13

Abstract

Non-Fermi liquid (NFL) behavior in the normal state of the heavy-fermion superconductor UBe13 is studied by means of low-temperature measurements of the specific heat, C, and electrical resistivity, ρ, on a high-quality single crystal in magnetic fields up to 15.5 T. At B=0, unconventional superconductivity forms at Tc=0.9 K out of an incoherent state, characterized by a large and strongly temperature dependent ρ(T). In the magnetic field interval 4 T \leq B \leq 10 T, ρ(T) follows a T^3/2 behavior for Tc(B)\leq T \leq 1 K, while ρis proportional to T at higher temperatures. Corresponding Non-Fermi liquid behavior is observed in C/T as well and hints at a nearby antiferromagnetic (AF) quantum critical point (QCP) covered by the superconducting state. We speculate that the suppression of short-range AF correlations observed by thermal expansion and specific heat measurements below T_L \simeq 0.7 K (B=0) yields a field-induced QCP, T_L \to 0, at B=4.5 T.

arXiv commentPresented at the M2S-2003 conference in Rio / Brazil

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Cited by in corpus (9)

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• Superconducting phases of f-electron compounds
• Unconventional Superconductivity
• Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13
• Magnetically Robust Non-Fermi Liquid Behavior in Heavy Fermion Systems with f^2-Configuration: Competition between Crystalline-Electric-Field and Kondo-Yosida Singlets
• UBe13 and U1-xThxBe13: Unconventional Superconductors
• Field-induced anomaly in the anisotropic non-Fermi-liquid normal state of UBe${}_{13}$
• Critical current density of hole doped high-Tc cuprates and heavy fermion superconductors: relevance to the possible quantum critical behavior
• Magnetic Properties of YbBe13 Probed by Neutron Scattering and Thermodynamic Measurements