A comparison between the Fehrenbacher-Rice and the Liechtenstein-Mazin models

Unoccupied electronic states of Y1-xPrxCu3O7-y (x = 0 - 1) thin films have been investigated using high-resolution polarization-dependent O K-edge x-r ay absorption spectroscopy (XANES). After determining the hole distribution among different oxygen sites of the Pr-doped thin films, we compare the ex perimental data with the Fehrenbacher and Rice (FR) model and the Liechtens tein and Mazin (LM) model, both of which are based on the hybridization of Pr 4f(z(x2-y2)) and O 2p(pi) orbitals in PrBa2Cu3O7-y. Our experimental res ults are more consistent with the FR model.