Abstract
The effects of laser irradiation on high-temperature superconducting YBa2Cu3O7-x thin films have been investigated by micro-Raman spectroscopy. Laser heating affects YBa2Cu3O7-x thin films to varying degrees at different laser power levels. For a laser power density below 1 mW μm-2, laser irradiation causes only thermal expansion within the focused area. When the laser power density is increased to about 1.7 mW μm-2, oxygen out-diffusion occurs. The orthorhombic to tetragonal structural phase transition was observed at 3.1 mW μm-2. Above 4.3 mW μm-2, chemical decomposition is inferred from the appearance of Raman bands due to the impurity phase BaCuO2. Comparison between the laser-heated results and the furnace-heated results was made, and the role played by temperature gradient and stress in the laser-heated sample is discussed in detail.
Original language | English (US) |
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Pages (from-to) | 1017-1022 |
Number of pages | 6 |
Journal | Superconductor Science and Technology |
Volume | 13 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2000 |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Ceramics and Composites
- Metals and Alloys
- Materials Chemistry
- Electrical and Electronic Engineering