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MM: Fachverband Metall- und Materialphysik

MM 26: Electronic properties III

MM 26.5: Talk

Wednesday, March 28, 2007, 17:45–18:00, H6

Theory of tunneling spectroscopy in UPd₂Al₃ — •David Parker¹ and Peter Thalmeier² — ¹MPIPKS, Nothnitzer Str. 38, Dresden 01187 — ²MPI CPFS, Nothnitzer Str. 40, Dresden 01187

There is still significant debate about the symmetry of the order parameter in the heavy-fermion superconductor UPd₂Al₃, with proposals for cos(k₃),cos(2k₃), sin(k₃), and e^iφsin(k₃). Here we analyze the tunneling spectroscopy of this compound and demonstrate that the experimental results by Jourdan et al (Nature 398, 47 (1999)) are inconsistent with the last two order parameters, which are expected to show zero-bias conductance peaks. We propose a definitive tunneling experiment to distinguish between the first two order parameters.