Absence of twinning in the 60 K superconducting phase of YBa2Cu3O7−δ
| Autor: | A. Nouruzi-Khorasani, K.N.R. Taylor |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Superconductivity
Materials science business.industry Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Oxygen Electronic Optical and Magnetic Materials Crystallography Optics Electron diffraction chemistry Lattice (order) Microscopy Limiting oxygen concentration Electrical and Electronic Engineering business Crystal twinning Single crystal |
| Zdroj: | Physica C: Superconductivity. 159:707-709 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(89)91307-5 |
| Popis: | The sequential observation of a number of areas of a large single crystal of YBa 2 Cu 3 O 7−δ using both optical and TEM microscopy has shown that in those regions in which there are no observable optical domains, there is also very little evidence for oxygen chain related twinning. In these same areas, electron diffraction (SAD) patterns clearly show the presence of the ( 1 2 0 0) super-lattice associated with an oxygen concentration close to O 6.5 (i.e. δ≈0.5). This has in turn been linked to the appearance of the 60 K transition and suggests that the lattice energetics of this alternate CuO chain occupancy does not favour twinning. |
| Databáze: | OpenAIRE |
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