Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Superconductivity: Tunnelling and Josephson Junctions
TT 26.3: Vortrag
Donnerstag, 8. September 2022, 10:00–10:15, H10
Highly-packed Nb-C Josephson junction arrays prepared by focused-ion-beam nanoprinting — •Fabrizio Porrati1, Felix Jungwirth1, Sven Barth1, Gian Carlo Gazzadi2, Stefano Frabboni2, Oleksandr V. Dobrovolskiy3, and Michael Huth1 — 1Goethe-University, Institut of Physics, Frankfurt a. M. — 2Nanoscience Institute-CNR, Modena — 3University of Vienna, Faculty of Physics, Vienna
Focused ion beam-induced deposition (FIBID) is a direct-write technique for the fabrication of nanostructures of any shape and dimension with high lateral resolution. Here, FIBID is employed to prepare Josephson junction arrays (JJA) consisting of superconducting Nb-C dots coupled through the proximity effect via a thin granular metal layer. The fabrication of the device is straightforward and it takes place in a few seconds. The microstructure and the composition of the JJA are investigated by transmission electron microscopy (TEM) and energy dispersive x-ray spectroscopy (EDS). The superconductor-to-metal transition of the JJA is studied directly by tuning the Josephson junction resistance in 70 nm-spaced Nb-C dots. The observed magnetoresistance oscillations with a period determined by the flux quantum give evidence for the coherent charge transport by paired electrons.