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Abstract:
We report muon spin rotation measurements on the antiferromagnetic
heavy-fermion superconductor UPd2Al3 in the superconducting state. The
London penetration depth is found to be approximately isotropic,
lambda(perpendicular to)(0) = 4800 +/- 500 Angstrom and lambda(parallel
to)(0) = 4500 +/- 500 Angstrom. The mu(+) Knight shift behavior below
T-c indicates that local moment magnetism and superconductivity are
carried by different electron substrates of 5f character, one of which
involves the heavy quasiparticles. For the latter a nearly isotropic
magnetic susceptibility (chi) = 1.7 x 10(-3) emu/mole can be estimated.
