Magnetic quantum critical point and superconductivity in UPt3 doped with   Pd
  Transverse-field muon spin relaxation measurements have been carried out on the heavy-fermion superconductor UPt3 doped with small amounts of Pd. We find that the critical Pd concentration for the emergence of the large-moment antiferromagnetic phase is ~0.6 at.%Pd. At the same Pd content, superconductivity is completely suppressed. The existence of a magnetic quantum critical point in the phase diagram, which coincides with the critical point for superconductivity, provides evidence for ferromagnetic spin-fluctuation mediated odd-parity superconductivity, which competes with antiferromagnetic order. 
A. de Visser, M.J. Graf, P. Estrela, A. Amato, C. Baines, D. Andreica,   F.N. Gygax, and A. Schenck