Scanning tunneling spectroscopy studies reveal long-range spatial homogeneity and predominantly d_x²-y²-pairing spectral characteristics in under- and optimally doped YBa₂Cu₃O_7-δ superconductors, whereas STS on YBa₂(Cu0.9934Zn0.0026Mg0.004)₃O6.9 exhibits microscopic spatial modulations and strong scattering near the Zn or Mg impurity sites, together with global suppression of the pairing potential. In contrast, in overdoped (Y0.7Ca0.3)Ba₂Cu₃O_7-δ, (d_x²-y²+s)-pairing symmetry is found, suggesting significant changes in the superconducting ground state at a critical doping value.
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Yeh et al. (2001) studied this question.
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