Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs
TT 51.13: Vortrag
Mittwoch, 9. März 2016, 18:30–18:45, H19
Josephson switching current investigated in a scanning tunneling microscope junction — •Jacob Senkpiel1, Berthold Jäck1, Matthias Eltschka1, Markus Etzkorn1, Christian R. Ast1, and Klaus Kern1,2 — 1Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart — 2École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Employing the I(V)-characteristics of a scanning tunneling microscope (STM) Josephson junction to directly determine the local order parameter of a superconductor would give a powerful tool to understand superconductivity on the atomic scale.
Recent research in this field led to some valuable insights to this technique [1,2].
Being able to perform not only voltage but also current biased measurements of the same junction gives us a new approach to study the physics involved in the Josephson effect.
Interestingly a comparison of the current and the voltage biased measurements shows that the Josephson switching current corresponds to the current value of the maximum in the voltage biased measurement.
In contrast to conventional planar tunneling geometries, an STM allows for precise control of the tunneling resistance and makes it possible to tune the Josephson coupling energy.
Using this ability we find, that the switching current is proportional to the square of the Josephson coupling energy.
B. Jäck et al., APL 106, 062904 (2015)
C.R. Ast et al., arXiv:1510.08449