1994/03/17 by R. Fehrenbacher, M. R. Norman · 4 citations
Materials Science · Mathematics · Physics and Astronomy · #Anisotropy #Condensed matter physics #Cuprate #Diagonal #Impurity #Iron-based superconductors research #Mathematics #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Renormalization #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat
paper · pdf · doi:10.1103/physrevb.50.3495
12 pages, uuencoded Postscript
arxiv created 1994/03/17 · openalex publication_date 1994/08/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We contrast the effects of nonmagnetic impurities on the properties of superconductors having a d_x2\mathrm\ensuremath-y2 order parameter, and a highly anisotropic s-wave (ASW) gap with the same nodal structure. The nonvanishing, impurity-induced, off-diagonal self-energy in the ASW state is shown to inhibit the low-energy excitations present in the clean system, leading to a qualitatively different impurity response of the single-particle density of states compared to the d_x2\mathrm\ensuremath-y2 state. We discuss how this behavior can be employed to distinguish one state from the other by an analysis of high-resolution angle-resolved photoemission spectra.