Abstract
Positive-muon spin rotation (μ + SR) measurements have been carried out in the new heavy-fermion superconductors UM2Al3, M=Ni and Pd. In UNi2Al3 the observedμ + frequencies in zero applied field indicate commensurate antiferromagnetic (AF) ordering of U moments ∼0.1μ 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-fieldμ + SR in the AF state of UPd2Al3 suggests symmetricμ + stopping sites. In this systemμ + SR linewidths belowT c yield a preliminary value of ∼8000 Å for the London penetration depth.
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