2005/11/30 by Y. C., Y. C. Ma, N. L. Wang · 21 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Coupling (piping) #Curvature #Doping #Geometry #Iron-based superconductors research #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Power law #Quasiparticle #Scattering #Scattering rate #Statistics #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.73.144503
published in Physical Review B 73(14) (American Physical Society) · 7 figures, Phys. Rev. B (accepted), the pdf file of previous (submission) version could not be generated properly
arxiv created 2006/02/27 · openalex publication_date 2006/04/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present in-plane optical study on Tl2Ba2CuO_6+\ensuremathδ single crystals with substantially different Tc. The study reveals that the overdoping does not lead to a further increase of the carrier density but a decrease of scattering rate. The most significant change occurs at low temperature and in the low frequency. A characteristic spectral feature, seen most clearly for the optimally doped sample and commonly ascribed to the mode coupling effect, weakens with doping and disappears in the heavily overdoped sample. Meanwhile, the optical scattering rate evolves from a linear \ensuremathω dependence to an upward curvature line shape. Both the temperature and frequency dependence of the scattering rate can be described by a power law relation. We elaborate that the overall decrease of the optical scattering rate originates from the increase of both the quasiparticle life time and the Fermi velocity near the (\ensuremathπ,0) region in the Fermi surface.