DocumentCode :
17077
Title :
Study of 
Josephson Junction Arrays and Sub- 
Junctions
Author :
Melbourne, T. ; Cunnane, D. ; Galan, E. ; Xi, X.X. ; Ke Chen
Author_Institution :
Temple Univ., Philadelphia, PA, USA
Volume :
25
Issue :
3
fYear :
2015
fDate :
Jun-15
Firstpage :
1
Lastpage :
4
Abstract :
Sandwich-type MgB2/MgO/MgB2 Josephson junctions with sizes ranging from 0.5 μm × 0.5 μm to 10 μm × 10 μm were fabricated using electron beam lithography. The junctions show critical current densities as high as 130 kA/cm2. The smallest of the junctions operated free of hysteresis below 4.2 K. They may be ideal for use in rapid single flux quantum circuits with no requirement for external shunt resistors. The 10-μm junctions show good agreement with the expected Fraunhofer-like modulation of critical current with magnetic field; however, the smaller junctions show a sinusoidal modulation, indicating an anomalous current distribution that needs to be further investigated. Series arrays of Josephson junctions were made to quantitatively study the uniformity of junction parameters, which shows a 54% spread in critical current of a 100 junction array of 4-μm junctions.
Keywords :
Josephson effect; critical current density (superconductivity); electron beam lithography; magnesium compounds; type II superconductors; Josephson junction series arrays; MgB2-MgO-MgB2; anomalous current distribution; critical current density; electron beam lithography; rapid single flux quantum circuits; sandwich-type Josephson junctions; sinusoidal modulation; size 10 mum; size 4 mum; Critical current density (superconductivity); Josephson junctions; Junctions; Lithography; Magnetic fields; Modulation; Resists; $hbox{MgB}_{2}$; Array; E-beam lithography; Josephson junction; Josephson junction,; MgB2; e-beam lithography;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2014.2366076
Filename :
6939650
Link To Document :
