Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.31: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Andreev reflection measurements using amorphous WC superconducting contact — •Jose Barzola-Quiquia, Michael Ziese, and Pablo Esquinazi — Division of Superconductivity and Magnetism, University of Leipzig, Leipzig, Germany

In this contribution we present point-contact Andreev reflection measurements of Co/ and Cu/tungsten-carbide (WC) contacts. The patterning of the metallic thin films samples was done using e-beam lithography. The tungsten carbide (WC) superconductor tip was grown directly on the investigated sample by decomposition of a metallo-organic vapor (tungsten hexacarbonil) under a focused Ga ion beam (FIB). Measurements were performed in standard four-point configuration with and without applied magnetic field. The experimental conductance-voltage curves were analyzed with the Blonder-Tinkham-Klapwijk theory [Phys. Rev. B 25, 4515 (1982)]. The results highlight the possibilities and advantages of using amorphous WC tips for point-contact spectroscopy of mesoscopic metallic samples.