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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yoshitake, T. Hattori, W. Tahara, S. |
| Copyright Year | 2002 |
| Abstract | The correlation between the copper composition and the microwave properties of YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) films is studied using coplanar waveguide resonators at 5 GHz. The c-axis lattice constant increases and the axial ratio b/a-the degree of orthorhombicity-decreases as the copper composition of the YBCO films decreases. The microwave properties of these films correlate well with these structural changes. The films with copper-rich composition have a low surface resistance R/sub s/ of 60 /spl mu//spl Omega/ at 50 K and a short magnetic penetration depth /spl lambda//sub L/(0) of 200 nm. The values of these quantities increase with decreasing copper composition. The films with less copper also show a gradual decrease in R/sub s/ below T/sub c,zero/, which is different from the tendency expected from the two-fluid model. These unusual microwave properties can be explained by the inhomogeneous superconductor model in which the regions with locally lowered T/sub c/ are distributed in the YBCO phase. The copper deficiencies that occurred in the films with less copper composition cause these inhomogeneities and thus they are an important cause of high R/sub s/ values of these YBCO films. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 3058 |
| Ending Page | 3061 |
| Page Count | 4 |
| File Size | 464943 |
| 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 | Yttrium barium copper oxide Superconducting films High temperature superconductors Superconducting microwave devices Magnetic films Surface resistance Grain boundaries Lattices Plasma temperature Coplanar waveguides |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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