Interplay between the pseudogap and superconductivity in HgBa$_2$CuO$_4$ single crystals

Details Interplay between the pseudogap and superconductivity in HgBa$_2$CuO$_4$ single crystals Interplay between the pseudogap and superconductivity in HgBa$_2$CuO$_4$ single crystals

2004-03-31

arxiv.org/abs/cond-mat/0403753v2

Phys. Rev. B 71, 012506 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.012506

We report a doping dependant Electronic Raman Scattering (ERS) study of HgBa$_2$CuO$_{4+\delta}$ (Hg-1201) single crystals. We investigate the dynamics of the antinodal and nodal quasiparticles. We show that the dynamical response of the antinodal quasiparticles is strongly reduced towards the underdoped regime in both the normal and superconducting states. When probing the nodal quasiparticles, we are able to distinguish between the energy scale of the pseudogap and that of the superconducting gap. A simple model relating the suppression of the dynamical response of the antinodal quasiparticles to fluctuations related to a competing phase is proposed.

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