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O: Fachverband Oberflächenphysik
O 52: Poster Session - New Methods: Experiments
O 52.12: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/1OG
Statistical evaluation of the switching current in a STM Josephson junction — •Martina Trahms1, Rika Simon1, Nils Bogdanoff1, Olof Peters1, Gaël Reecht1, Clemens B. Winkelmann2, and Katharina J. Franke1 — 1Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Univ. Grenoble Alpes, Institut Neél, 25 Avenue des Martyrs, 38042 Grenoble, France
The intrinsic order of the superconducting ground state is given by the superconducting order parameter. In a Josephson junction this order parameter can be determined by measuring the junction’s critical current. A Josephson junction is formed in a scanning tunneling microscope (STM) using a superconducting tip in close proximity to a superconducting surface. In the I-V characteristic of this junction the transition from the Cooper pair to the quasi particle tunneling regime is specified by the switching current. In a purely thermal activated system the switching current follows a Poisson distribution around the critical current. However, the distribution of the switching current might also be sensitive to other energy fluctuations, e.g. quantum noise and spin related excitations induced by magnetic adatoms. To investigate these activation processes we statistically analyse the switching current in a Josephson junction formed between a Pb tip and Pb(111) surface.