High-T_c Josephson Junction Arrays Fabricated by He-FIB

authored by: Max Pröpper, Dominik Hanisch, Christoph Schmid, Marius Neumann, Paul Julius Ritter, Marc André Tucholke, Edward Goldobin, Dieter Koelle, Reinhold Kleiner, Meinhard Schilling, Benedikt Hampel
Abstract: The development of a fabrication process for Josephson junctions (JJs) using a direct-write helium-focused ion beam (He-FIB) technique provides the opportunity to control parameters such as the critical current <FOR VERIFICATION>$I$_c and normal-state resistance <FOR VERIFICATION>$R$_n of individual JJs in YBa₂Cu₃O_7-xJJ arrays. Such arrays could be used as a voltage calibration standard that is operated at higher temperatures and higher driving frequencies than the currently used niobium JJ arrays. This study presents the fabrication process of 79 YBa₂Cu₃O_7-xJJs in a meander array design using a direct writing He-FIB process with the same irradiation dose for all JJs. In this design, each of the JJs can be measured individually, and adjacent JJs that exhibit similar and suitable parameters for a voltage standard array can be measured in series. The scattering of the JJ parameters was investigated at 5 K and resulted in a spread in <FOR VERIFICATION>$I$_c of about 60% and in <FOR VERIFICATION>$R$_n of 25%. However, a couple of subarrays with a spread lower than 10% could be found. In addition, these JJ subarrays were irradiated with high-frequency radiation in the GHz and THz range at a temperature of 20 K and synchronization of up to three JJs was observed in both frequency ranges.
External Organisation(s): Technische Universität Braunschweig
University of Tübingen
Type: Article
Journal: IEEE Transactions on Applied Superconductivity
ISSN: 1051-8223
Publication date: 12.12.2024
Publication status: E-pub ahead of print
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Electrical and Electronic Engineering
Electronic version(s): https://doi.org/10.1109/TASC.2024.3516741 (Access: Unknown)

BibTeX

@article{cf88d4e126964a3aaed1aa661846779e,
title = "High-Tc Josephson Junction Arrays Fabricated by He-FIB",
abstract = "The development of a fabrication process for Josephson junctions (JJs) using a direct-write helium-focused ion beam (He-FIB) technique provides the opportunity to control parameters such as the critical current $I$c and normal-state resistance $R$n of individual JJs in YBa2Cu3O7-xJJ arrays. Such arrays could be used as a voltage calibration standard that is operated at higher temperatures and higher driving frequencies than the currently used niobium JJ arrays. This study presents the fabrication process of 79 YBa2Cu3O7-xJJs in a meander array design using a direct writing He-FIB process with the same irradiation dose for all JJs. In this design, each of the JJs can be measured individually, and adjacent JJs that exhibit similar and suitable parameters for a voltage standard array can be measured in series. The scattering of the JJ parameters was investigated at 5 K and resulted in a spread in $I$c of about 60% and in $R$n of 25%. However, a couple of subarrays with a spread lower than 10% could be found. In addition, these JJ subarrays were irradiated with high-frequency radiation in the GHz and THz range at a temperature of 20 K and synchronization of up to three JJs was observed in both frequency ranges.",
keywords = "He-FIB, HTS, JJ array, Josephson junction (JJ), Shapiro step, THz, YBaCuO",
author = "Max Pr{\"o}pper and Dominik Hanisch and Christoph Schmid and Marius Neumann and Ritter, {Paul Julius} and Tucholke, {Marc Andr{\'e}} and Edward Goldobin and Dieter Koelle and Reinhold Kleiner and Meinhard Schilling and Benedikt Hampel",
note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",
year = "2024",
month = dec,
day = "12",
doi = "10.1109/TASC.2024.3516741",
language = "English",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
}

High-Tc Josephson Junction Arrays Fabricated by He-FIB

High-T_c Josephson Junction Arrays Fabricated by He-FIB