Characterization of Co-Substituted YBa2Cu3O7-d Superconductors by Raman Spectroscopy. Application of Raman Spectroscopy to High-Tc Superconductors. (1).

Raman scattering from high-Tc superconductors.

Raman scattering experiments from high-1; superconductors of the RBa2Cu307-~ type, with R Y, Pr, Nd, Eu, Gd, Dy, and Yb, are reported. Because of the great difBculty in obtaining single-phase samples, spectra from all starting compounds and other known phases of Y-Ba-Cu are presented. This systematic approach has allowed the identi6cation of the lines observed in Raman spectra of the supercondu...

Raman continuum in high-Tc superconductors

Experimentally, Raman continuum for Ag and Bg geometry exhibits peaks far apart from each other (about 80 to 150 cm−1) in frequency. The former is insensitive to doping over a small range where Tc does not vary much whereas the latter shifts towards higher frequencies. We calculate the electronic Raman scattering intensities using the ‘modified spin bag model’. We show that the calculated resul...

Anelastic spectroscopy studies of high-Tc superconductors

Two families of cuprates exhibiting high-Tc superconductivity, YBa2Cu3O6+x (YBCO) and La2xSrxCuO4+δ (LSCO), have been extensively studied by anelastic spectroscopy, by measuring the complex dynamic Young’s modulus E (ω, T ) = E′ + iE′′ of ceramic samples at frequencies of 0.5-20 kHz between 1 and 900 K. Results are also presented on oxygen vacancies in the ruthenocuprate RuSr2GdCu2O8−δ. The ela...

Role of Symmetry in Raman Spectroscopy of Unconventional Superconductors

The role of symmetry of the inelastic light scattering amplitude, the superconducting energy gap, and the underlying Fermi surface manifold on the Raman spectra of unconventional superconductors is discussed in detail. Particular emphasis is placed on both single and bi-layer superconductors. It is found that the B1g channel may be the most sensitive to doping due to the role of the Van Hove si...

High Performance Method for Skin Roughness Detection Using Raman Spectroscopy