Antiferromagnetism and the node structure of the superconducting order parameter of UPd \(\)Al \(\)
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The node structure of the superconducting order parameter of the heavy-fermion system \(\) is analyzed within the weak-coupling theory. A pairing interaction induced by the exchange of antiferromagnetic spin excitations is assumed as suggested by recent inelastic neutron scattering experiments and tunneling spectroscopy. The multi-sheeted Fermi surface is taken into account. Based on a model susceptibility for the simple antiferromagnetic structure of \(\), line nodes result at the rim of the magnetic Brillouin zone.
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