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We present results from point-contact spectroscopy of the antiferromagneticheavy-fermion superconductor UPd$_2$Al$_3$: conductance spectra are taken fromsingle crystals with two major surface orientations as a function oftemperature and magnetic field, and analyzed using a theory of co-tunnelinginto an Anderson lattice. Spectroscopic signatures are clearly identifiedincluding the distinct asymmetric double-peak structure arising from theopening of a hybridization gap when a coherent heavy Fermi liquid is formed.Both the hybridization gap, found to be 7.2 $\pm$ 0.3 meV at 4 K, and theconductance enhancement above a flat background decrease upon increasingtemperature. While the hybridization gap is extrapolated to remain finite up to$\sim$28 K, close to the temperature around which the magnetic susceptibilitydisplays a broad peak, the conductance enhancement vanishes at $\sim$18 K,slightly above the antiferromagnetic transition temperature ($T_\textrm{N}$$\approx$ 14 K). This rapid decrease of the conductance enhancement isunderstood as a consequence of the junction drifting away from the ballisticregime due to increased scattering off magnons associated with the localized U5$f$ electrons. This shows that while the hybridization gap opening is notdirectly associated with the antiferromagnetic ordering, its visibility in theconductance is greatly affected by the temperature-dependent magneticexcitations. Our findings are not only consistent with the 5$f$ dual-naturepicture in the literature but also shed new light on the interplay between theitinerant and localized electrons in UPd$_2$Al$_3$.

Hybridization gap in the heavy-fermion compound UPd$_2$Al$_3$ via quasiparticle scattering spectroscopy