Electronic Structure Of cuprate Superconductors in The Presence of Out-of-Plane Impurities

Abstract

The recently discovered the strong deviation from a simple d-wave superconducting gap form in cuprate superconductors in the presence of out-of-plane impurities is calling for an explanation. Within the framework of the kinetic energy driven superconducting mechanism, the electronic structure of cuprate superconductors in the presence of the out-of-plane impurities is studied. It is shown that with increasing the concentration of theout-of-plane impurities, although both sharp superconducting coherence peaks around nodal and antinodal regions are suppressed, the position of the leading-edge mid-point of the electron spectrum around the nodal region remains at the same position, while it is shifted towards higher binding energies around the antinodal region, this leads to a striking behavior of the deviation from a simpled-wave superconducting gap form in cuprate superconductors in the presence of out-of-plane impurities. In particular, the magnitude of this deviation increases with increasing the out-of-plane impurity concentration.