Infrared scattering rate of overdoped Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$

Abstract

We present in-plane optical study on Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$ single crystals with substantially different $T_c$. 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-$\omega$ dependence to an upward curvature lineshape. 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 ($\pi$,0) region in the Fermi surface.

7 figures, Phys. Rev. B (accepted), the pdf file of previous (submission) version could not be generated properly

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Cited by in corpus (7)

• Universal sheet resistance and revised phase diagram of the cuprate high-temperature superconductors
• Doping dependent optical properties of Bi2Sr2CaCu2O8+d
• Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
• Transport properties of the metallic state of overdoped cuprate superconductors from an anisotropic marginal Fermi liquid model
• Optical and dc conductivities of cuprates: Spin-fluctuation scattering in the t-J model
• In-plane optical spectra of Y${}_{1-x}$Ca${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$: Overdoping and disorder effect on residual conductivity
• Two distinct quasiparticle inelastic scattering rates in the $t-J$ model and their relevance for high-$T_c$ cuprates superconductors