Optical Spectroscopy as a Probe of Gaps and Kinetic Electronic Energy in p- and n-type cuprates
Abstract
The real part of the optical in-plane conductivity of p-- and n--type cuprates thin films at various doping levels was deduced from highly accurate reflectivity measurements. We present here a comprehensive set of optical spectral weight data as a function of the temperature T (> Tc), for underdoped and overdoped samples. The temperature dependence of the spectral weight is not universal. Using various cut-off frequencies for the spectral weight, we show that n--type Pr2-xCexCuO4 and p--type Bi2Sr2CaCu2O8+δ exhibit both similarities and striking differences. The Fermi surface is closed in overdoped metallic samples. In underdoped Pr2-xCexCuO4 samples, it clearly breaks into arcs, giving rise to a "pseudogap" signature. It is argued that such a signature is subtle in underdoped Bi2Sr2CaCu2O8+δ.
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