Optimization and magnetic field behavior of sputtered submicron YBa/sub 2/Cu/sub 3/O/sub 7/ step-edge Josephson-junctions
| Autor: | M. Vaupel, G. Ockenfuss, Roger Wördenweber |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Josephson effect
Superconductivity High-temperature superconductivity Materials science Condensed matter physics Sputter deposition Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetic field Planar law Etching (microfabrication) Cathode ray Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 7:3454-3457 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.622131 |
| Popis: | YBa/sub 2/Cu/sub 3/O/sub 7/ step-edge junctions with widths down to 0.5 /spl mu/m are fabricated on SrTiO/sub 3/-substrates by Ar ion-beam milling of the steps, high-pressure on-axis magnetron sputtering and, finally, electron beam patterning and ion-beam etching of the microbridge. For ratios of film thickness to step height of about 1/2 the current-voltage characteristics show Shapiro steps under microwave irradiation and RSJ (resistively shunted junction)-like behavior. The periodic dependence of the critical current upon the magnetic field resembles a Fraunhofer-pattern. The period of the current variation /spl Delta/B/sub 0/ depends upon the width w of the junction according to the theoretical prediction for planar thin Josephson junctions: /spl Delta/B/sub 0/=1.84/spl phi//sub 0//w/sup 2/. Junctions with widths of 0.7 /spl mu/m possess a large magnetic field stability with /spl Delta/B/sub 0//spl ap/100 G. Small junctions (w |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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