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
Ilya EreminInstitute für Mathematische und Theoretische Physik, TU-Braunschweig, D-38106 Braunschweig, GermanyEvelina TsonchevaDepartment of Physics, University of Wisconsin, Madison, Wisconsin 53706, USAAndrey V. ChubukovDepartment of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
2008en
ABI
Abstract
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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Cited by 40 references