Two-band model of Raman scattering on electron-doped high- Tc superconductors

C. S. Liu, H. G. Luo, W. C. Wu, T. Xiang

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We have analyzed the B1g and B2g Raman spectra of electron-doped cuprate superconductors Nd2-x Cex CuO4 and Pr2-x Cex CuO4 using a weakly coupled two-band model. One of these two bands is centered around (±π2, ±π2) and couples more strongly with the B2g mode, while the other is centered around (±π,0) and (0,±π) and couples more strongly with the B1g mode. This model explains in a natural way why the B2g Raman peak occurs at a higher frequency than the B1g one at optimal doping, and how these two peaks change with doping in agreement with experiments. The result thus supports that there are two kinds of quasiparticles in electron-doped cuprates and d x2 - y2 -wave superconductivity is driven by the holelike band and a proximity effect on the electronlike band.

Original languageEnglish
Article number174517
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number17
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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