Influence of hole correlation on polarized-x-ray-emission spectra of single-crystal ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$

Polarized-x-ray OKα and CuLα spectra of the high-${\mathit{T}}_{\mathit{c}}$ superconducting ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ compound are presented. They show strong anisotropic features. The possible location of the holes, which are thought to be responsible for the superconducting properties, are discussed in the light of these experimental spectra. It seems that the ${\mathrm{CuO}}_2$ and BaO planes are important layers for these oxygenlike holes. Because of charge transfer and correlation effects, characteristic spectral features are obtained.