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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Sydow, J.P. Buhrman, R.A. |
| Copyright Year | 2002 |
| Abstract | We report on the effect of 200-500C ozone anneals on the resistivity versus temperature (RT) and Raman spectra characteristics of YBa/sub 2/Cu/sub 3-x/Co/sub x/O/sub 2/ (Co-YBCO) thin films, with x=0.3, 0.5, 0.75, and 1.0. Cold wall anneals are conducted at /spl sim/1 aim. of a flowing O/sub 2//O/sub 3/ mixture with /spl sim/2% O/sub 3/ by weight. The enhanced partial pressure of atomic oxygen, relative to canonical O/sub 2/ anneals, provided by ozone to the surface of Co-YBCO films, leads to enhanced oxygenation. This is demonstrated by the observation of an increase in T/sub c/ (25 K to 75 K for x=0.3, 0 to 38 K for x=0.5, and 0 to a T/sub c/(onset) of 19 K for x=0.75) and improvement in Raman spectra data following ozone anneals. This high degree of oxygenation is unstable under O/sub 2/ anneals at temperatures as low as 200C. We attribute this to the fact that the partial pressure of oxygen above well oxygenated Co-YBCO is greater than 1 atm. at /spl sim/200C. We will discuss the implication of these results for the stability and uniformity of SNS ramp edge Josephson junctions which employ Co-YBCO N-layers. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 1994 |
| Ending Page | 1997 |
| Page Count | 4 |
| File Size | 465043 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 9 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Annealing Transistors Yttrium barium copper oxide Superconducting materials Josephson junctions Conductivity High temperature superconductors Superconducting transition temperature Doping Conducting materials |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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