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The electronic Raman scattering has been investigated in optimally oxygendoped YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ single crystals as well as in crystalswith non-magnetic, Zn, and magnetic, Ni, impurities. We found that theintensity of the A$_{1g}$ peak is impurity independent and their energy to$T_{c}$ ratio is almost constant ($2\Delta/k_{B}T_{c}\sim5$). Moreover, thesignal at the B$_{1g}$ channel is completely smeared out when non-magnetic Znimpurities are present. These results are qualitatively interpreted in terms ofthe Zeyher and Greco's theory that relates the electronic Raman scattering inthe A$_{1g}$ and B$_{1g}$ channels to \textit{d}-CDW and superconducting orderparameters fluctuations, respectively.Comment: Submited to Phys. Rev. Let

physical review. b, condensed matter and materials physics

Origin of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>g</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>g</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>electronic Raman scattering peaks in …

Origin of theA1gandB1gelectronic Raman scattering peaks in …