The polarization dependence of the Cu LIII absorption spectrum was measured on a Bi2Sr2CaCu2O8 single crystal with linearly polarized synchrotron radiation. The Cu LIII absorption peak shows no energy difference between the z (3d3z2-r2) and the x,y(3dx2-y2) component, which is consistent with the electron-energy-loss study by N̈cker et al., but is different from the previous x-ray absorption studies by Bianconi et al. and Abbate et al. The relative intensity of the z component to the x,y component was estimated to be less than 5%, suggesting a very small contribution of the Cu 3d3z2-r2 orbital to the electronic structure in the vicinity of the Fermi level.
ASJC Scopus subject areas
- Condensed Matter Physics