Extended Impurity Potential in a d_{x^2-y^2} Superconductor

Details Extended Impurity Potential in a d_{x^2-y^2} Superconductor Extended Impurity Potential in a d_{x^2-y^2} Superconductor

1997-01-22

arxiv.org/abs/cond-mat/9701170v1

Physics

Condensed Matter

Superconductivity

4 pages, Revtex, with 4 embedded eps figures. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.56.2360

We investigate the role of a finite potential range of a nonmagnetic impurity for the local density of states in a d_{x^2-y^2} superconductor. Impurity induced subgap resonances are modified by the appearance of further scattering channels beyond the $s$--wave scattering limit. The structure of the local density of states (DOS) in the vicinity of the impurity is significantly enhanced and therefore improves the possibility for observing the characteristic anisotropic spatial modulation of the local DOS in a d_{x^2-y^2} superconductor by scanning tunneling microscopy.

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