Abstract
We investigate the effect of site-selective isotope substitution on the Raman spectra of the yttrium-barium cuprate by means of first-principles bandstructure calculations. Upon oxygen isotope substitution we find a dramatic change in the Raman scattering intensities which is much more pronounced than the shift of the phonon frequencies. This effect is due to large changes in the eigenvectors caused by the site-selective substitution.
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