Influence of Gap Extrema on the Tunneling Conductance Near an Impurity in an Anisotropic Superconductor

Details Influence of Gap Extrema on the Tunneling Conductance Near an Impurity in an Anisotropic Superconductor Influence of Gap Extrema on the Tunneling Conductance Near an Impurity in an Anisotropic Superconductor

1993-06-22

arxiv.org/abs/cond-mat/9306048v2

Physics

Condensed Matter

12 pages (revtex) + 3 figures (included - postscript), NSF-ITP-93-81

Scientific paper

10.1103/PhysRevLett.71.3363

Changes: figures added in postscript form, Eq. (7) and various typos corrected. We examine the effect of an impurity on the nearby tunneling conductance in an anisotropically-gapped superconductor. The variation of the conductance has pronounced spatial dependence which depends strongly on the Fermi surface location of gap extrema. In particular, different gap symmetries produce profoundly different spatial features in the conductance. These effects may be detectable with an STM measurement on the surface of a high-temperature superconductor.

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