Theory of Raman scattering on electron-doped high-$T_c$ superconductor

Abstract

We have analyzed the $B_{1g}$ and $B_{2g}$ Raman spectra of electron-doped cuprate superconductors Nd${}_{2-x}$Ce${}_x$CuO${}_4$ and Pr${}_{2-x}$Ce${}_x$CuO${}_4$ using a weakly coupled two-band model. One of these two bands is centered around $(\pm \pi /2,\pm \pi /2)$ and couples more strongly with the $B_{2g}$ mode, while the other is centered around $(\pm \pi ,0)$ and $(0,\pm \pi )$ and couples more strongly with the $B_{1g}$ mode. This model explains in a natural way why the $B_{2g}$ Raman peak occurs at a higher frequency than the $B_{1g}$ one at optimal doping, and how these two peaks change with doping in agreement with experiments. Our result suggests that the superconducting pairing in electron-doped high-$T_c$ cuprates has the $d_{x^2-y^2}$-wave symmetry and results from the same mechanism as for hole doped materials.

arXiv comment5 RevTeX4 pages, 3 EPS figures, replaced with published version (two tables added)

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Cited by in corpus (12)

• Inelastic Light Scattering From Correlated Electrons
• Nodeless d-wave superconducting pairing due to residual antiferromagnetism in underdoped Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$
• Hole-pocket-driven superconductivity and its universal features in the electron-doped cuprates
• Weak coupling Bardeen-Cooper-Schrieffer suerconductivity in the Electron-Doped Cuprate Superconductors
• Nodeless superconductivity in the infinite-layer electron-doped Sr_0.9La_0.1CuO_2 cuprate superconductor
• Transport anomalies and quantum criticality in electron-doped cuprate superconductors
• Gap function symmetry and spin dynamics in electron-doped cuprate superconductor
• Theory of point contact spectroscopy in electron-doped cuprates
• Energy Scales in the Raman spectrum of electrons and hole doped cuprates within competing scenarios
• Impurity resonance states in electron-doped high T_c superconductors
• Superfluid density in the slave-boson theory
• Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high-$T_c$ cuprates