Title :
YBa/sub 2/Cu/sub 3/O/sub 7/ nano-bridge junctions and dc SQUIDs made by focused ion beam milling
Author :
Blank, D.H.A. ; Booij, W. ; Hilgenkamp, H. ; Vulink, B. ; Veldhuis, D. ; Rogalla, H.
Author_Institution :
Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands
fDate :
6/1/1995 12:00:00 AM
Abstract :
YBa/sub 2/Cu/sub 3/O/sub 7/ nano-bridges with widths ranging from 200 to 800 nm were made using Focused Ion Beam milling. The I-V characteristics of the narrowest nano-bridges show, under microwave irradiation, pronounced Shapiro steps up to the transition temperature. An inductively shunted single layer SQUID, using these nano-bridges, has been realised by a combination of Focused Ion Beam milling and selective epitaxial growth. Flux to voltage modulation up to 82 K was observed, with a maximum modulation depth of 3.7 /spl mu/V at 78 K.<>
Keywords :
SQUIDs; barium compounds; critical currents; focused ion beam technology; high-temperature superconductors; ion beam applications; superconducting device testing; superconducting microbridges; vapour phase epitaxial growth; yttrium compounds; 20 to 82 K; 200 to 800 nm; 3.7 muV; DC SQUID; I-V characteristics; Shapiro steps; YBa/sub 2/Cu/sub 3/O/sub 7/; YBa/sub 2/Cu/sub 3/O/sub 7/ nano-bridge junctions; critical current; flux to voltage modulation; focused ion beam milling; inductively shunted single layer SQUID; maximum modulation depth; microwave irradiation; selective epitaxial growth; transition temperature; Bridge circuits; Epitaxial growth; Etching; Ion beams; Milling; Nanostructures; SQUIDs; Superconducting transition temperature; Voltage; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
