Signatures of non-monotonic d-wave gap in electron-doped cuprates

TL;DR

This paper investigates whether the non-monotonic d-wave gap in electron-doped cuprates explains optical and Raman scattering data below the critical temperature, providing theoretical calculations that match experimental observations.

Contribution

The study demonstrates that a non-monotonic d-wave gap produces specific features in optical and Raman responses consistent with experimental data in electron-doped cuprates.

Findings

Non-monotonic d-wave gap features match experimental data

Optical conductivity and Raman scattering signatures are explained

Theoretical calculations support non-monotonic gap presence

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 non-monotonic along the Fermi surface. We calculate the conductivity and Raman intensity for elastic scattering, and find that a non-monotonic 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 Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$ compounds.