Abstract
Heavy fermion superconductor UPd 2Al 3 exhibits intriguing behavior that superconductivity coexists with antiferromagnetic ordering in atomic scale. We investigated the superconducting gap structure of UPd 2Al 3 by thermal conductivity measurements with rotating magnetic field H in various directions relative to the crystal axes. Distinct two-fold oscillation of thermal conductivity was observed with rotating H within the ac plane, while no oscillation was observed within the basal plane. These angular variations indicate the superconducting gap function Δ( k ) has a single line node orthogonal to the c-axis. Our experimental results deduce the superconducting gap function of UPd 2Al 3 as d-wave symmetry with a form Δ( k ) = Δ 0cos( k z c).
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