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Distinguishing d-wave from highly anisotropic s-wave superconductors

L. S. Borkowski·P. J. Hirschfeld
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Abstract

Systematic impurity doping in the Cu-O plane of the hole-doped cuprate superconductors may allow one to decide between unconvention al ("d-wave") and anisotropic conventional ("s-wave") states as possible candidates for the order parameter in these materials. We show that potential scattering of any strength always increases the gap minima of such s-wave states, leading to activated behavior in temperature with characteristic impurity concentration dependence in observable quantities such as the penetration depth. A magnetic component to the scattering may destroy the energy gap and give rise to conventional gapless behavior, or lead to a nonmonotonic dependence of the gap on impurity concentration. We discuss how experiments constrain this analysis.

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L. S. Borkowski, P. J. Hirschfeld. 2010-04-02. Distinguishing d-wave from highly anisotropic s-wave superconductors. https://doi.org/10.1103/physrevb.49.15404

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