Charge dynamics of Ca_{2-x}Na_{x}CuO_{2}Cl_{2} as a correlated electron system with the ideal tetragonal lattice

TL;DR

This study investigates the charge dynamics of Ca_{2-x}Na_{x}CuO_{2}Cl_{2} with a perfect tetragonal lattice, revealing doping-dependent optical properties and universal scattering rate behavior similar to other cuprates.

Contribution

It provides detailed optical conductivity analysis of CNCOC, highlighting differences from LSCO and demonstrating a universal scattering rate trend across doping levels.

Findings

Absence of 1.5 eV peak in CNCOC due to reduced charge-stripe instability.

Universal doping-dependent scattering rate Gamma(omega) observed.

Saturation of Gamma(omega) at high frequencies linked to resistivity saturation.

Abstract

We report the reflectivity and the resistivity measurement of Ca_{2-x}Na_{x}CuO_{2}Cl_{2} (CNCOC), which has a single-CuO2-plane lattice with no orthorhombic distortion. The doping dependence of the in-plane optical conductivity spectra for CNCOC is qualitatively the same to those of other cuprates, but a slight difference between CNCOC and LSCO, i.e., the absence of the 1.5 eV peak in CNCOC, can be attributed to the smaller charge-stripe instability in CNCOC. The temperature dependence of the optical onductivity spectra of CNCOC has been analyzed both by the two-component model (Drude+Lorentzian) and by the one-component model (extended-Drude analysis). The latter analysis gives a universal trend of the scattering rate Gamma(omega) with doping. It was also found that Gamma(omega) shows a saturation behavior at high frequencies, whose origin is the same as that of resistivity saturation at high temperatures.