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Properties of multilevel ramp edge junctions and SQUIDs with laser-ablated SrTiO/sub 3/ barriers

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6 Author(s)
Laibowitz, R.B. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Sun, J.Z. ; Foglietti, V. ; Koch, R.H.
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We have fabricated junctions and DC SQUIDs using laser ablation for both the YBCO electrodes and the thin SrTiO/sub 3/ (STO) barrier regions in a variety of device configurations. These SQUIDs operate reliably at 77 K and preliminary results on a limited number of devices show that they store reasonably well for periods in excess of one year, and exhibit only small changes with repeated cycles (/spl sim/10) between room temperature and 77 K. Noise measurements made using bias reversing on a SQUID (92 pH) at 77 K give a white noise of about 15 /spl mu//spl Phi//sub 0///spl radic/Hz and a 1/f upturn at about 0.2 Hz.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )

Date of Publication:

June 1995

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