Impurity bound states in disordered d-wave superconductors.
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.
Moradian
Rostam
R
Physics Department, Razi University, Kermanshah, Iran. rostambristol@yahoo.com
Györffy
Balazs L
BL
Annett
James F
JF