TY  - JOUR
A1  - Porrati, Fabrizio
A1  - Jungwirth, Felix
A1  - Barth, Sven
A1  - Gazzadi, Gian Carlo
A1  - Frabboni, Stefano
A1  - Dobrovolskiy, Oleksandr V.
A1  - Huth, Michael
T1  - Highly-packed proximity-coupled DC Josephson junction arrays by a direct-write approach
T2  - Advanced functional materials
N2  - Focused ion beam induced deposition (FIBID) is a direct-write technique enabling the growth of individual nanostructures of any shape and dimension with high lateral resolution. Moreover, the fast and reliable writing of periodically arranged nanostructures can be used to fabricate devices for the investigation of collective phenomena and to design novel functional metamaterials. Here, FIBID is employed to prepare dc-Josephson junction arrays (dc-JJA) consisting of superconducting NbC dots coupled through the proximity effect via a granular metal layer. The fabrication is straightforward and allows the preparation of dc-JJA within a few seconds. Microstructure and composition of the arrays are investigated by transmission electron microscopy and energy dispersive X-ray spectroscopy. The superconductor-to-metal transition of the prepared dc-JJA is studied in a direct way, by tuning the Josephson junction resistance in 70 nm-spaced superconducting NbC dots. The observed magnetoresistance oscillations with a period determined by the flux quantum give evidence for the coherent charge transport by paired electrons. Moreover, the measured resistance minima correspond to two fundamental matching configurations of fluxons in the dc-JJA, caused by magnetic frustration. The robust properties of the prepared dc-JJA demonstrate the opportunities for a fast preparation of complex device configurations using direct-write approaches.
KW  - direct-write fabrications
KW  - focused ion beam induced depositions
KW  - Josephson junction arrays
KW  - magnetic frustration
KW  - nanolithography
KW  - NbC
KW  - superconductor-to-metal transition
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/73508
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-735086
SN  - 1616-3028
N1  - Support through the Frankfurt Center of Electron Microscopy (FCEM) and the European Cooperation in Science and Technology via COST Action No. CA16218 (NANOCOHYBRI) are gratefully acknowledged.
N1  - Open access funding enabled and organized by Projekt DEAL.
N1  - The data that support the findings of this study are available from the corresponding author upon reasonable request.
VL  - 32.2022
IS  - 36, art. 2203889
SP  - 1
EP  - 8
PB  - Wiley-VCH
CY  - Weinheim
ER  -