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

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

2005-12-08

arxiv.org/abs/cond-mat/0512173v2

Phys. Rev. B 73, 174517 (2006)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.73.174517

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.

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