Doping dependent optical properties of Bi2Sr2CaCu2O8+δ
By Jungseek Hwang, T. Timusk, G. Gu. 2006
135 citations recorded by the source corpus.
We report on the ab-plane reflectance of the high temperature superconductor Bi2Sr2CaCu2O8+δ (Bi-2212). Measurements on samples spanning the doping range from underdoped with Tc = 67 K (UD), to optimally doped with Tc = 96 K (OPT), to overdoped with Tc = 60 K (OD) were made from room temperature down to the superconducting state regime. The measured reflectance data were analysed to extract the optical conductivity and the real and imaginary parts of the free carrier optical self-energy. We get an estimate of the dc resistivity from the low frequency extrapolation of the optical conductivity and the superfluid density from the imaginary part of the optical conductivity. The conductivity sum rule can be related to the changes of the kinetic energy of the system. When this system becomes a superconductor, the kinetic energy decreases in the underdoped samples and increases in the overdoped ones. The optical self-energy, obtained from the extended Drude model, is dominated by two channels of interaction: a sharp mode and a broad background. The amplitude of the mode is strongly doping and temperature dependent whereas the background decreases weakly with doping and is nearly temperature independent.
Subfields: Condensed Matter Physics, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/a41143addf48579465b64ff955269d777df3bab2
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In Condensed Matter Physics
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Citations in the corpus
- Electrodynamics of correlated electron materials (2011, background): “A constant phase angle of 60 degrees up to at least 5000 cm−1 is observed in optimally doped Bi2Sr2CaCu2O8 (Hwang et al., 2007; van der Marel et al., 2003), shown in Fig.”
- Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach (2016, methodology): “The EDM has been widely employed to discuss the dynamics of the charge carriers in copper oxides and its relation with the onset of superconductivity [110, 115, 225, 239, 244–251].”
- Theory of universal incoherent metallic transport (2014, background): “Substantial broadening of the Drude peak at increasing temperatures is also seen in the T -linear resistivity regimes of, for instance, Bi-2212 (refs 36,37) and YBCO (ref.”