Influence of collective effects and the d-CDW on electronic Raman scattering in high-T${}_c$ superconductors

Abstract

Electronic Raman scattering in high-T${}_c$ superconductors is studied within the t-J model. It is shown that the A${}_{1g}$ and B${}_{1g}$ spectra are dominated by amplitude fluctuations of the superconducting and the d-wave CDW order parameters, respectively. The B${}_{2g}$ spectrum contains no collective effects and its broad peak reflects vaguely the doping dependence of T${}_c$, similarly to the pronounced peak in the A${}_{1g}$ spectrum. The agreement of our theory with the experiment supports the picture of two different, competing order parameters in the underdoped regime of high-T${}_c$ superconductors.

arXiv comment4 pages, 4 figures, will appear in PRL

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