Details
Original language | English |
---|---|
Journal | IEEE Transactions on Applied Superconductivity |
Early online date | 12 Dec 2024 |
Publication status | E-pub ahead of print - 12 Dec 2024 |
Externally published | Yes |
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 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 <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.
Keywords
- He-FIB, HTS, JJ array, Josephson junction (JJ), Shapiro step, THz, YBaCuO
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: IEEE Transactions on Applied Superconductivity, 08.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High-Tc Josephson Junction Arrays Fabricated by He-FIB
AU - Pröpper, Max
AU - Hanisch, Dominik
AU - Schmid, Christoph
AU - Neumann, Marius
AU - Ritter, Paul Julius
AU - Tucholke, Marc André
AU - Goldobin, Edward
AU - Koelle, Dieter
AU - Kleiner, Reinhold
AU - Schilling, Meinhard
AU - Hampel, Benedikt
N1 - Publisher Copyright: © 2002-2011 IEEE.
PY - 2024/12/12
Y1 - 2024/12/12
N2 - 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.
AB - 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.
KW - He-FIB
KW - HTS
KW - JJ array
KW - Josephson junction (JJ)
KW - Shapiro step
KW - THz
KW - YBaCuO
UR - http://www.scopus.com/inward/record.url?scp=85212556285&partnerID=8YFLogxK
U2 - 10.1109/TASC.2024.3516741
DO - 10.1109/TASC.2024.3516741
M3 - Article
AN - SCOPUS:85212556285
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
ER -