Abstract
YBCO films on single-crystalline MgO substrates and polycrystalline Ag substrates were prepared by chemical vapor deposition in magnetic fields up to 10 T, using a cryo-cooled superconducting magnet. In the case of the MgO substrates, microstructure was independent of the magnetic field but Jc was significantly improved. In contrast, with polycrystalline Ag substrates, the microstructure changed drastically; again Jc was improved. Large square-shaped grains with a size of 5-14 μm were observed for samples grown on Ag substrates at 0 T. These grains were reduced in size when a field of several tesla was applied during the CVD process and their shape became irregular above 4 T. These changes of the microstructure improve the critical current density. The values of Jc for the films deposited on the polycrystalline Ag substrates in 8 T were 5.76×104 A/cm2 at 0 T and 77.3 K.
Original language | English |
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Pages (from-to) | 482-485 |
Number of pages | 4 |
Journal | Physica B: Condensed Matter |
Volume | 294-295 |
DOIs | |
Publication status | Published - 2001 Jan |
Keywords
- Chemical vapor deposition
- Critical current density
- High magnetic fields
- MgO
- Polycrystalline Ag
- YBaCuOfilm
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering