Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 3: Correlated Electrons - Heavy Fermions
TT 3.3: Vortrag
Freitag, 4. März 2005, 10:45–11:00, TU H3027
Tunneling spectroscopy on epitaxial superconducting UNi2Al3 thin films — •Andrey Zakharov, Martin Jourdan, and Hermann Adrian — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudinger Weg 7, 55128 Mainz, Germany
Tunneling spectroscopy experiments on thin film planar junctions of the heavy-fermion superconductor UNi2Al3 were performed. Employing an in vacuo process it was possible to prepare cross-junctions with a*-axis oriented epitaxial thin films of UNi2Al3 as a base electrode, artificial insulating layer of AlOx as a barrier and a well-known superconducting metal (Pb or In) as a counter electrode. The typical tunneling densities of states of the superconducting counter electrodes including strong coupling features were observed, proving the contacts to be in the tunneling regime with an essentially pin-hole free barrier. In the normal magnetically ordered state of the heavy-fermion compound a pseudogap was observed. First result of direct probing the superconducting density of states of UNi2Al3 are presented.