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Regensburg 2007 – scientific programme

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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 Thalmeier21MPIPKS, 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 eiφsin(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.

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