Effect of the nonmonotonic d-wave superconducting gap on the electronic Raman scattering of electron-doped cuprate superconductors

Abstract

ABSTRACT By considering a nonmonotonic d-wave superconducting (SC) gap effect in electron-doped cuprate superconductors, the energy and momentum dependence of the electronic Raman scattering is studied. The electronic Raman scattering of electron-doped cuprate superconductors has obvious differences with hole-doped case described by a pure d-wave SC gap, which can be attributed to the nonmonotonic d-wave SC gap in electron-doped cuprate superconductors. Three main different behaviours for the electronic Raman scattering spectra between electron-doped and hole-doped cuprate superconductors have been obtained, the intensity comparison of and spectra, the Raman peak positions as a function of energy for and spectra, and energy asymptotic behaviour of the low-energy spectrum. For electron-doped cuprate superconductors, the intensity of spectrum as a function of energy is larger than one, and the Raman peak position of spectrum appears at a higher energy than one, then the low-energy spectrum of as a function of energy increases linearly, not energy dependence. All these theoretical results of electron-doped cuprate superconductors are in qualitative agreement with the corresponding Raman scattering experimental data.