Coupling between quasiparticles and a bosonic mode in the normal state of HgBa${}_2$CuO${}_{4+\delta }$

Abstract

We report a doping dependent study of the quasiparticles dynamics in HgBa${}_2$CuO${}_{4+\delta }$ via Electronic Raman Scattering. A well-defined energy scale is found in the normal state dynamics of the quasiparticles over a broad doping range. It is interpreted as evidence for coupling between the quasiparticles and a collective bosonic mode whose energy scale depend only weakly with doping. We contrast this behavior with that of the superconducting gap whose amplitude near the node continuously decreases towards the underdoped regime. We discuss the implications of our findings on the nature of the collective mode and argue that electron-phonon coupling is the most natural explanation.

arXiv comment5 pages, 4 figures

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• The nodal gap component as a good candidate for the superconducting order parameter in cuprates
• Universal relationship between the energy scales of the pseudogap phase, the superconducting state and the charge density wave order in copper oxide superconductors
• Fluctuating Cu-O-Cu Bond model of high temperature superconductivity in cuprates
• Pseudogap in cuprates driven by d-wave flux-phase order proximity effects: A theoretical analysis from Raman and ARPES experiments