From an antiferromagnet to a heavy-fermion system: CeCu5Au under pressure
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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