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TT: Tiefe Temperaturen

TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)

TT 6.40: Poster

Monday, March 24, 2003, 14:30–19:00, P2c, P2d

Quasiparticle interference effects in high-temperature superconductor - manganite junctions — •Mitja Schonecke, Bettina Welter, Lambert Alff, and Rudolf Gross — Walther-Meißner-Institut, Walther-Meißner-Str. 8, 85748 Garching

The tunneling conductance in d-wave superconductor / insulator / doped manganite (dS-I-F) junctions is still not satisfactorily clarified. We used YBa₂Cu₃O_7−δ / La_2/3Ba_1/3MnO_3−δ ramp-type junctions in order to investigate the interplay of ferromagnetism and unconventional superconductivity. 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. The conductance spectra of junctions with small contact area show multiple sharp features which might be a due to phase coherence of Andreev reflected quasiparticles on a mesoscopic length scale.