TY - JOUR
T1 - Charge dynamics of Ca2-xNaxCuO2Cl 2 as a correlated electron system with the ideal tetragonal lattice
AU - Waku, K.
AU - Katsufuji, T.
AU - Kohsaka, Y.
AU - Sasagawa, T.
AU - Takagi, H.
AU - Kishida, H.
AU - Okamoto, H.
AU - Azuma, M.
AU - Takano, M.
N1 - Funding Information:
The authors would like to thank T. Hanaguri for technical assistance on resistivity measurements and helpful discussions, K. Takenaka for sending us his data of LSCO, and S. Miyasaka and Y. Tokura for their help with the measurement at UV-SOR. This work was partly supported by a Grant-in-Aid for The 21st Century COE Program (Physics of Self-organization Systems) at Waseda University from the Ministry of Education, Sports, Culture, Science and Technology of Japan.
PY - 2004/10
Y1 - 2004/10
N2 - We report the reflectivity and the resistivity measurement of Ca 2-xNaxCuO2Cl2 (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 conductivity 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 Γ(ω) with doping. It was also found that Γ(ω) shows a saturation behavior at high frequencies, whose origin is the same as that of resistivity saturation at high temperatures.
AB - We report the reflectivity and the resistivity measurement of Ca 2-xNaxCuO2Cl2 (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 conductivity 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 Γ(ω) with doping. It was also found that Γ(ω) shows a saturation behavior at high frequencies, whose origin is the same as that of resistivity saturation at high temperatures.
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U2 - 10.1103/PhysRevB.70.134501
DO - 10.1103/PhysRevB.70.134501
M3 - Article
AN - SCOPUS:42749102921
VL - 70
SP - 134501-1-134501-8
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 13
M1 - 134501
ER -