Abstract
The reduction of negative charge at grain boundary (GB) dislocations in Ca doped YBa2Cu3O7 (YBCO) was compared to undoped YBCO. Compared to large-angle GB, the small GBs were shown to offer unique opportunities that reveal electrostatic properties of separated interfacial dislocation of cores. It was found that due to the finite width of the valence band in the superconducting CuO2 planes, the negative GB charge leads to a depletion of electron holes available for superconductivity. A significant reduction in the size of the perturbed region in the Ca-doped samples was found to be the principle mechanism for the improved interfacial superconductivity.
Original language | English |
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Article number | 195502 |
Journal | Physical Review Letters |
Volume | 92 |
Issue number | 19 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |
Keywords
- Calcium
- Electron holography
- Electronic properties
- Electronic structure
- Grain boundaries
- Ground state
- Magnetooptical devices
- Semiconductor doping
- Spectroscopic analysis
- Superconductivity
- Transmission electron microscopy
- Yttrium barium copper oxides
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