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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chandler, J.G. Jiang, J. Cai, X.Y. Schwartzkopf, L.A. Larbalestier, D.C. |
| Copyright Year | 2002 |
| Abstract | Significant differences exist, of order a factor of two, in irreversibility field at 77 K of Ag-clad (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ (Bi-2223) composites from different sources. In the present case, we have studied the 30-77 K irreversibility field and J/sub c/ performance of post annealed Bi-2223 samples. Post annealing in the temperature range 800-750/spl deg/C significantly raises both J/sub c/ and the irreversibility field. At 77 K, the irreversibility field was characterized both by the decrement field, H/sub p/, defined by J/sub c/(H)/spl prop/exp(-H/H/sub p/) and by the glass transition field, H/sub g/, defined by the change in sign of the curvature of the voltage-current characteristics. At lower temperatures, where only magnetization measurements were made, H/sub p/ and the Kramer function extrapolation field, H/sub K/ were used. H/sub p/ (77 K) ranges from 0.143-0.170 T and H/sub g/ (77 K) from 0.082-0.164 T. Higher post annealing temperatures produced larger values of both H/sub K/ and H/sub p/ at 30-50 K. H/sub K/ (30 K) varied from 8-10 T. Two tapes from leading manufacturers had H/sub K/ (30 K) values of 7.3 and 10 T, bracketing the results obtained in our post-annealed tapes. We conclude that sample-to-sample variations of irreversibility field at 77 K carry over to lower temperatures too and that optimizing the irreversibility field properties at 77 K is very valuable for lower temperature Bi-2223 performance too. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 2945 |
| Ending Page | 2948 |
| Page Count | 4 |
| File Size | 284047 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 13 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Magnetic field measurement Annealing Glass Current density Flux pinning Strontium Temperature distribution Magnetization Extrapolation Magnetic fields |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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