Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.19: Poster

Montag, 8. März 2004, 14:30–19:00, Poster A

Tunneling spectra of high-temperature superconductor - manganite junctions — •Mitja Schonecke, Bettina Welter, Lambert Alff, and Rudolf Gross — Walther-Meißner-Institut, Walther-Meißner-Str. 8, 85748 Garching

We use YBa₂Cu₃O_7−δ ramp-type junctions to investigate the conductance spectra of superconductor-normal metal (S/N) and superconductor-ferromagnet (S/F) interfaces. The geometry of ramp-type junctions takes advantage of the larger coherence length of the superconductor in the ab-plane by coupling the two electrodes in this direction. With our fabrication process it is possible to obtain samples either in the tunneling limit or in the highly transparent Andreev-regime. While the S/N samples in the tunneling limit show splitting of the zero bias conductance peak at zero magnetic fields, the Andreev-spectra of S/F junctions are dominated by multiple sharp features. The origin of theses features has not yet been clarified.