Abstract
We show evidence from transmission electron microscopy of an unusual change in columnar defect morphology in YBCO upon annealing to 600°C. The disappearance of the nanotwinned, but not the larger scaled thermal twinned, structure is found. A removal of the large fluctuations in the diameter of the amorphous column, preserving a narrow continuous column, is surprisingly discovered. Correlations with magnetization measurements demonstrate the greater efficiency of vortex pinning at 77 K by the annealed defect structure.
| Original language | English |
|---|---|
| Pages (from-to) | R9.9.1/O14.9.1-R9.9.1/O14.9.6 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 650 |
| State | Published - 2001 |
| Externally published | Yes |
| Event | Microstructural Processes in Irradiated Materials-2000 - Boston, MA, United States Duration: Nov 27 2000 → Nov 29 2000 |
Funding
The authors thank Wai Kwok for assistance with irradiations and George Crabtree for the provision of laboratories and materials. The work of Yan and Kirk was supported by the U.S. DoE, Office of Science under contract No. W-31-109-Eng-38. The work of Petrean and Paulius was supported by the NSF under Grant No. DMR-00-72880.
| Funders | Funder number |
|---|---|
| U.S. DOE | |
| National Science Foundation | |
| Office of Science |