2005/06/30 by Y. Gallais, Yann Gallais, M. Le Tacon +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/epl/i2005-10422-6
published as Europhys. Lett. 73, 594 (2006) · 5 pages, 4 figures
openalex publication_date 2006/01/12 · arxiv created 2006/03/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We report a doping-dependent study of the quasiparticles dynamics in HgBa 2 CuO 4 + δ 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 depends only weakly on 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.