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Abstract:
Positive-muon spin rotation (mu+SR) measurements have been carried out
in the new heavy-fermion superconductors UM2Al3, M = Ni and Pd. In
UNi2Al3 the observed mu+ frequencies in zero applied field indicate
commensurate antiferromagnetic (AF) ordering of U moments approximately
0.1-mu(B)/U atom. These moments coexist with superconductivity and have
the highest values observed in an AF heavy-fermion superconductor. The
absence of well-defined frequencies in zero-field mu+SR in the AF state
of UPd2Al3 suggests symmetric mu+ stopping sites. In this system mu+SR
linewidths below T(c) yield a preliminary value of approximately 8000
angstrom for the London penetration depth.
