Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique
TT 32.17: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Structure and local electronic properties of Ag and Co/Ag on Nb(110) — •Tihomir Tomanic1, Christoph Sürgers1, and Hilbert v. Löhneysen1,2 — 1Physikalisches Institut, Universität Karlsruhe — 2Institut für Festkörperphysik, Forschungszentrum Karlsruhe
The local variation of the superconductive order parameter in hybrid structures of a superconductor S with a normal metal N or ferromagnet F is a topic of current interest. We have started a study of Ag and Co islands on Nb via scanning tunneling microscopy (STM) and spectroscopy (STS) at low temperatures.
As a prerequisite, we report on the surface structure of clean Nb(110) single crystals obtained after Ar+ sputtering and flash heating up to 2300 ∘C in ultra-high vacuum. The atomic structure as well as the local superconducting properties have been explored by STM and STS at T=2.5 and T=4.2 K. We have studied the topography of a thin Ag overlayer (nominal thickness 5nm) on Nb(110) and of Co islands on top of the Ag overlayer. First results of the local electronic density of states derived from the current-voltage characteristics will be reported.