Physics – Condensed Matter – Superconductivity
Scientific paper
2004-08-19
Physics
Condensed Matter
Superconductivity
8 pages, 11 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.70.134501
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.
Azuma Masaki
Katsufuji Takuro
Kishida Hideo
Kohsaka Yoshihito
Okamoto Hajime
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