Charge dynamics of Ca 2 − x Na x CuO 2 Cl 2 as a correlated electron system with the ideal tetragonal lattice

摘要: We report the reflectivity and resistivity measurement of ${\mathrm{Ca}}_{2\ensuremath{-}x}{\mathrm{Na}}_{x}{\mathrm{CuO}}_{2}{\mathrm{Cl}}_{2}$ (CNCOC), which has a single-${\mathrm{CuO}}_{2}$-plane lattice with no orthorhombic distortion. The doping dependence in-plane optical conductivity spectra for CNCOC is qualitatively same to those other cuprates, but slight difference between LSCO, i.e., absence $1.5\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ peak in CNCOC, can be attributed smaller charge-stripe instability CNCOC. temperature been analyzed both by two-component model (Drude+Lorentzian) one-component (extended-Drude analysis). latter analysis gives universal trend scattering rate $\ensuremath{\Gamma}(\ensuremath{\omega})$ doping. It was also found that shows saturation behavior at high frequencies, whose origin as temperatures.