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

H. Wilhelm; S. Raymond; D. Jaccard; O. Stockert; H. v. Loehneysen

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

Strongly Correlated Electrons 2007-05-23 v1 Superconductivity

Authors: H. Wilhelm , S. Raymond , D. Jaccard , O. Stockert , H. v. Loehneysen

Abstract

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.

Keywords

heavy fermion antiferromagnetic order pressure effect superconductivity CeCu5Au

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@article{arxiv.cond-mat/9908442,
  title  = {From an antiferromagnet to a heavy-fermion system: CeCu5Au under pressure},
  author = {H. Wilhelm and S. Raymond and D. Jaccard and O. Stockert and H. v. Loehneysen},
  journal= {arXiv preprint arXiv:cond-mat/9908442},
  year   = {2007}
}

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4 pages, RevTex, 4 figures

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

Abstract

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