Two Distinct Electronic Contributions in the Fully Symmetric Raman Response of High $T_c$ Cuprates

Abstract

We show by non resonant effect in HgBa${}_2$CuO${}_{4+\delta }$ (Hg-1201)and by Zn substitutions in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ (Y-123) compounds that the fully symmetric Raman spectrum has two distinct electronic contributions. The A${}_{1g}$ response consists in the superconducting pair breaking peak at the 2$\Delta$ energy and a collective mode close to the magnetic resonance energy. These experimental results reconcile the \textit{d-wave} model to the A${}_{1g}$ Raman response function in so far as a collective mode that is distinct from the pair breaking peak is present in the A${}_{1g}$ channel.

arXiv comment4 pages, 2 figures

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• Lattice dynamical signature of charge density wave formation in underdoped YBa2Cu3O6+x
• Electronic Raman Scattering in copper oxide Superconductors: Understanding the Phase Diagram
• Investigations on the relationship between $T_c$ and the superconducting gap under magnetic and non-magnetic impurity substitutions in YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Spin-roton excitations in the cuprate superconductors
• Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering
• Superconducting pairing and the pseudogap in nematic striped La2-xSrxCuO4
• $\eta$ collective mode as A${}_{1g}$ Raman resonance in cuprate superconductors
• Collective mode in the SU(2) theory of cuprates