Abstract
The effects of laser irradiation on high-temperature superconductingYBa2Cu3O7-x thin films have been investigated bymicro-Raman spectroscopy. Laser heating affects YBa2Cu3O7-x thin films to varying degrees at different laser power levels. For alaser power density below 1 mW µm-2, laser irradiationcauses only thermal expansion within the focused area. When the laser powerdensity is increased to about 1.7 mW µm-2, oxygenout-diffusion occurs. The orthorhombic to tetragonal structural phasetransition was observed at 3.1 mW µm-2. Above 4.3 mW µm-2, chemical decomposition is inferred from the appearanceof Raman bands due to the impurity phase BaCuO2. Comparison betweenthe laser-heated results and the furnace-heated results was made, and the roleplayed by temperature gradient and stress in the laser-heated sample isdiscussed in detail.
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