From an antiferromagnet to a heavy-fermion system: CeCu5Au under pressure
H. Wilhelm, S. Raymond, D. Jaccard, O. Stockert, H. v. Loehneysen
Abstract
The electrical resistivity rho(T) of single crystalline CeCu5Au under pressure was measured in the temperature range 30mK<T<300K. Pressure suppresses the antiferromagnetic order (TN=2.35K at ambient pressure) and drives the system into a non-magnetic heavy-fermion state above Pc=4.1(3)GPa. The electrical resistivity shows a deviation from a T2 dependence of a Fermi-liquid in the pressure range 1.8GPa<=P<=5.15GPa. The rho(T)-curves can be compared with those of CeCu6-xAux at different Au concentrations. Just before the long-range magnetic order vanishes, a possibly superconducting phase (at Tc=0.1K and P=3.84GPa) occurs, pointing to a coexistence of antiferromagnetic order and superconductivity. This new phase is only seen in a narrow pressure interval Delta P=0.4GPa.
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