Signature of the nonmonotonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave gap in electron-doped cuprates

We address the issue whether the data on optical conductivity and Raman scattering in electron-doped cuprates below ${T}_{c}$ support the idea that the $d$-wave gap in these materials is nonmonotonic along the Fermi surface. We calculate the conductivity and Raman intensity for elastic scattering and find that a nonmonotonic gap gives rise to several specific features in optical and Raman response functions. We argue that all these features are present in the experimental data on ${\mathrm{Nd}}_{2\ensuremath{-}x}{\mathrm{Ce}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ and ${\mathrm{Pr}}_{2\ensuremath{-}x}{\mathrm{Ce}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ compounds.

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