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 UPt (3) doped with small amounts of Pd. We find that the critical Pd concentration for the emergence of the large-moment antiferromagnetic phase is approximately 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.
de Visser A
Van der Waals-Zeeman Institute, University of Amsterdam, 1018 XE Amsterdam, The Netherlands.
Graf
M J
MJ
Estrela
P
P
Amato
A
A
Baines
C
C
Andreica
D
D
Gygax
F N
FN
Schenck
A
A