Abstract
Micro-Raman spectroscopy is well suited for microstructural analysis of (YBCO) superconductors. Of particular interest is the oxygen stoichiometry, 7-x, on which many superconducting properties depend. It is common to use the frequency of the Raman spectral peak near to obtain a quantitative measure of 7-x. Another peak exists near . The variation of the position of this peak appears to be minimal as 7-x changes. However, this peak is asymmetric for orthorhombic YBCO and symmetric for tetragonal YBCO. We have observed a variation in the asymmetry of this peak with 7-x, in Raman spectra obtained from single grains in a sample of polycrystalline YBCO. We propose the use of this peak's asymmetry as a quantitative means to measure oxygen stoichiometry.
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