Gap Renormalization in Dirty Anisotropic Superconductors: Implications for the Order Parameter of the Cuprates
Abstract
We contrast the effects of non-magnetic impurities on the properties of superconductors having a \ order parameter, and a highly anisotropic s-wave (ASW) gap with the same nodal structure. The non-vanishing, impurity induced, off-diagonal self-energy in the ASW state is shown to gap out 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 \ state. We discuss how this behaviour can be employed to distinguish one state from the other by an analysis of high-resolution angle-resolved photoemission spectra.
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