title: Impurity bound states in disordered d-wave superconductors.
abstract: Recent STM experiments on Bi2Sr2Ca2Cu3O10 observed sharp bound states associated with Zn and Ni impurities, as previously predicted theoretically. Here we extend the theory to the case of a finite concentration of impurities. Using the nonlocal coherent potential approximation, we show that the resonance peak both broadens and shifts as a function of impurity concentration.
authors.affiliation: Physics Department, Razi University, Kermanshah, Iran. rostambristol@yahoo.com
authors.forename: Rostam
authors.initials: R
authors.lastname: Moradian
authors.forename: Balazs L
authors.initials: BL
authors.lastname: Györffy
authors.forename: James F
authors.initials: JF
authors.lastname: Annett