In studies of the optical spectrum of lightly doped semiconducting crystals containing CuO 2
planes, we have observed absorption maxima that occur at the same energies as excitations …

In good conductors optical phonons are usually screened, and therefore not observed.
However, sharp features due to infrared-active modes in the copper-oxygen planes are …

The exciton absorption spectrum of Cu 2 O has been measured at low temperatures. As
reported by Gross, the observed lines fit a hydrogen-like series formula. The wavelength …

The optical spectra of YBa 2 Cu 3 O 7− x and other Cu-O-based superconductors have
several common features in the visible and near uv. Chemical changes that affect the …

The ab-plane reflectance of a Nd 1.85 Ce 0.15 CuO 4 single crystal (T c= 23 K) has been
measured from≈ 35 to 9500 cm− 1 at temperatures above and below T c, and the optical …

We review the field of high temperature cuprate superconductors, with emphasis on the
nature of their electronic properties. After a general overview of experiment and theory, we …

Optical-phonon spectra were investigated for single crystals of the parent materials of
various cuprate superconductors and related materials. Comparing the spectra, all the …

Raman scattering experiments have been carried out on single crystals of cupric oxide
(CuO) in the temperature range from 15 K to 300 K. The symmetry of the three first order …

The optical phonon spectra were investigated for single crystals of various insulating copper
oxides with a single CuO 2 plane, mainly for the (214)-compounds with the T-, T′-and T∗ …

Recent energy dispersion measurements in several families of the hole-doped copper
oxides have revealed a kink in the energy vs momentum relation. These have tentatively …