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

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arxiv cond-mat/9908442 v1 pith:6BSRDFJY submitted 1999-08-30 cond-mat.str-el cond-mat.supr-con

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

H. Wilhelm , S. Raymond , D. Jaccard , O. Stockert , H. v. Loehneysen This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords pressureorderantiferromagneticcecuelectricalheavy-fermionphaserange
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The electrical resistivity rho(T) of single crystalline CeCu_5Au under pressure was measured in the temperature range 30mK<T<300K. Pressure suppresses the antiferromagnetic order (T_N=2.35K at ambient pressure) and drives the system into a non-magnetic heavy-fermion state above P_c=4.1(3)GPa. The electrical resistivity shows a deviation from a T^2 dependence of a Fermi-liquid in the pressure range 1.8GPa<=P<=5.15GPa. The rho(T)-curves can be compared with those of CeCu_{6-x}Au_x at different Au concentrations. Just before the long-range magnetic order vanishes, a possibly superconducting phase (at T_c=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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