STUDIES ON INFRARED-SPECTRA OF HIGH-TEMPERATURE SUPERCONDUCTORS

The anisotropic behaviour of high-temperature superconductors in their infrared spectra is reported systematically for the first time. A the oretical description is given. Based on the studies on the infrared sp ectra of the samples which are Y-system single crystal films, Y-system compounds annealed at different quenching temperatures and the Pr-dop ed Y-system single phase compounds, the systematical assignments of in frared phonons of these high temperature superconducting compounds are made. It is proposed that the lattice vibrations in the CuO2 plane ha ve a close relation with the high temperature superconductivity. The r ole of these vibrations in superconductivity is discussed further.