Exact diagonalization study on nonmagnetic impurity effects in high-image superconductors Original Research Article

We perform the numerically exact diagonalization study of the d–p and single-band Hubbard models with Zn impurities and compare the physical properties between the two models. We obtain similar phase diagrams for the ground states between the eight-site clusters of the d–p and the Hubbard models. We find that the hole distribution and spin correlation functions show good correspondence between the models and conclude that the single-band model is relevant for describing the effects of Zn impurity.