Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Poster Session: Superconductivity 2

TT 55.17: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

Current contributions in a superconducting SET due to Josephson transport — •Susanne Sprenger, Thomas Lorenz, and Elke Scheer — Universität Konstanz, 78467 Konstanz, Deutschland

When measuring superconducting transport trough two tunnel junction separating a small island from the leads, Coulomb blockade effects can be observed. Using orthodox theory [1, 2] one can identify the contributions to the current through this all superconducting single electron transistor (SSET).

We investigate a SSET formed by one oxide barrier and one mechanically controllable break junction (MCBJ). We present measurements on samples, differing in the transparency of the oxide barrier, either allowing only tunneling or in addition Josephson transport, whereas the MCBJ is broken to form a mere tunnel contact. In the Josephson regime additional contributions to the current in the superconducting gap can be observed, giving first evidence for coherent transport. The measurements are compared with the predictions of orthodox theory.

[1] K. K. Likharev, Proc. IEEE 87, 606 (1999)

[2] R. J. Fitzgerald, Phys. Rev. B 57, R11073(R) (1997)