Optical Spectroscopy as a Probe of Gaps and Kinetic Electronic Energy in p- and n-type cuprates

Nicole Bontemps

doi:10.1016/j.physc.2007.04.186

paper

Optical Spectroscopy as a Probe of Gaps and Kinetic Electronic Energy in p- and n-type cuprates

arXiv:cond-mat/0610307 · doi:10.1016/j.physc.2007.04.186

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 $T (> T_{c}$ ), 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 Pr $_{2 - x}$ Ce $_{x}$ CuO $_{4}$ and p--type Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ exhibit both similarities and striking differences. The Fermi surface is closed in overdoped metallic samples. In underdoped Pr $_{2 - x}$ Ce $_{x}$ CuO $_{4}$ samples, it clearly breaks into arcs, giving rise to a "pseudogap" signature. It is argued that such a signature is subtle in underdoped Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ .

Proceedings M2SHTSCVIII, to appear in Physica C

Optical Spectroscopy as a Probe of Gaps and Kinetic Electronic Energy in p- and n-type cuprates

Abstract

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