Phase diagram of a d-wave superconductor with Anderson impurities (1004.0426v1)

Abstract: We present a self-consistent solution for a model of a d-wave superconductor with finite concen- tration of Anderson impurities at zero temperature using the slave boson method. We show how the phase diagram depends on the strength of interaction between impurity and extended states. For fixed impurity level energy $E_0$ in the Kondo limit there is one superconducting-normal state transition for all impurity concentrations $n$. When $E_0$ is close the Fermi energy there are three such transitions for impurity concentration exceeding certain minimum value $n(\Gamma_0,E_0)$. If hybridization $\Gamma_0$ is fixed and the depth of the impurity level is varied, there are always two transitions for concentration above $n(\Gamma_0,E_0)$.