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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.28: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Investigation of proximity systems with very low temperature STS — •Wolz Michael, Debuschewitz Christian, Kunej Vojko, and Scheer Elke — Fachbereich Physik, Universität Konstanz, 78457 Konstanz

We have investigated the superconducting proximity effect of double layer superconductor (S)- normal metal (N) systems with a very low temperature STM with high energy resolution. We used the BCS-superconductor Al. We have measured the density of states (DOS) for different thicknesses of the N-layer and for different N-materials (Au, Ag and Pd). The DOS of the Pd samples show a strong suppression of the superconuctivity in comparison to the Au and Ag samples. A possible explanation for that could be the strong electron-spin fluctuation coupling in Pd [2]. Our experimental data were fitted with a theoretical model of Belzig et al. [1] to check the dependence of the DOS on the interface quality and on the coherence lengths in N and S.

[1] W. Belzig, C. Bruder and G. Schön, Phys. Rev. B 54, 9443 (1996)

[2] T. Konzos et al., Phys. Rev. Lett. 93, 137001 (2004)