Impurity scattering effects in STM studies of high-image superconductors Original Research Article

Recent STM measurements have observed many inhomogeneous patterns of the local density of states on the surface of high-TcTc cuprates. As a first step to study such disordered strong correlated systems, we use the BdG equation for the t –t′t′–t″t″–J model with an impurity. The impurity is taken into account by a local potential or local variation of the hopping/exchange terms. Strong correlation is treated by a Gutzwiller mean-field theory with local Gutzwiller factors and local chemical potentials. It turned out that the potential impurity scattering is greatly suppressed, while the local variation of hoppings/exchanges is enhanced.