Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-07-17
Physica C 408--410 (2004) 157--160.
Physics
Condensed Matter
Strongly Correlated Electrons
Presented at the M2S-2003 conference in Rio / Brazil
Scientific paper
10.1016/j.physc.2004.02.070
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, \rho, 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 \rho(T). In the magnetic field interval 4 T \leq B \leq 10 T, \rho(T) follows a T^3/2 behavior for Tc(B)\leq T \leq 1 K, while \rho is 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.
Gegenwart Philip
Helfrich R.
Kim Jinyoung Serena
Lang Martin
Langhammer C.
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