Vibrational Raman scattering from high Tc single crystals
Abstract
Polarized Raman spectra of single crystals of the high-Tc materials A2BCu3O(x) with A = Ba and Sr, B = Y and La, and x between 6 and 7 have been measured. The dependence of the 500/cm peak position on chemical composition is in agreement with its assignment to the O(1) axial stretching vibration. The intensity of the 600/cm band, which has been ascribed to a defect-induced Cu-O mode, strongly depends on the crystal preparation and resulting purity. It is concluded that Raman spectroscopy, in addition to providing information about the lattice dynamics, is an important tool for the characterization of the oxygen stoichiometry and purity of these high-Tc oxides.
- Publication:
-
High-Temperature Superconductors
- Pub Date:
- 1988
- Bibcode:
- 1988mrs..proc..781K
- Keywords:
-
- High Temperature Superconductors;
- Mixed Oxides;
- Raman Spectra;
- Single Crystals;
- Vibrational Spectra;
- Barium Oxides;
- Copper Oxides;
- Lanthanum Oxides;
- Polarization Characteristics;
- Strontium Compounds;
- Yttrium Oxides;
- Solid-State Physics