Doping evolution of the optical scattering rate and effective mass of Bi(2)Sr(2-x)La(x)CuO(6)

TL;DR

This study investigates how the optical scattering rate and effective mass evolve across different doping levels in Bi(2)Sr(2-x)La(x)CuO(6), revealing a persistent pseudogap and doping-dependent charge density.

Contribution

It provides comprehensive optical conductivity measurements across the phase diagram, highlighting the doping independence of effective mass and the linear variation of charge density.

Findings

Pseudogap persists into the overdoped regime.

Effective mass remains constant across doping levels.

Optical charge density varies linearly with doping.

Abstract

We determined the optical conductivity of Bi(2)Sr(2-x)La(x)CuO(6) at dopings covering the phase diagram from the underdoped to the overdoped regimes. The frequency dependent scattering rate shows a pseudogap extending into the overdoped regime. We found that the effective mass enhancement calculated from the optical conductivity is constant throughout the phase diagram. Conversely, the effective optical charge density varies almost linearly with doping. Our results suggest that the low frequency electrodynamics of Bi(2)Sr(2-x)La(x)CuO(6) is not strongly affected by the long range Mott transition.