ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The Raman spectra of YBa2 Cu3 O7-δ superconducting thin film deposited on Inconel with a TiN buffer layer by a laser ablation technique are reported. The results indicate that the film is fully oxygenated, homogeneous and polycrystalline and has a preferred orientation along the c-axis. No evidence of interdiffusion between the film and the substrate was found. Unusual photoinduced changes in the Raman spectra were observed by varying the incident cw Ar+ (514.5 nm) laser power densities between 50 to 250 ± 5 W mm-2. The increase in the intensity ratios of the out-of-phase and in-phase c-axis bending vibrations of O(2) - O(3) oxygen atoms to that of the axial symmetric stretching vibration of bridging oxygen O(4) (i.e. I337/I503 and /I445/I503) and the decrease in the full-width at half-maximum intensity (FWHM) of the out-of-phase, c-axis bending vibration (337 cm-1) can be attributed to the improvement in the crystallinity of the film due to oxygen ordering in the CuO2 planes induced by laser irradiation.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250250406
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