FAR-INFRARED OPTICAL-ABSORPTION STUDY AND CHARACTERIZATION OF Y1BA2CU3O7-DELTA PR0.5Y0.5BA2CU3O7-DELTA SUPERLATTICES/

We report infrared reflection measurements on Y1Ba2Cu3O7-delta/Pr0.5Y0 .5Ba2Cu3O7-delta (60 Angstrom/60 Angstrom, 16 layers and 60 Angstrom/2 4 Angstrom, 16 layers on SrTiO3 (100) substrate) high T-C superconduct ing superlattice films. We measured absorption spectrum of these films from 30 - 700 cm(-1)(3.7 - 66.9 meV) and 80 - 300 K. These films show ed resistive superconducting transitions with an on set at 80 K. Some of the phonons are smear out because of strong electron-phonon mediati on The appearance of vibration modes are around 547, 361, 279, 172, 15 0, 125 cm(-1) at 80 K. Some contribution and interaction between layer s were observed from measured spectra. The different configuration of interlayer thickness of these superlattices have 1 - 2 cm(-1) peaks sh ift in spectra. The dielectric and electron-phonon behaviors due to in teraction of superlattice layers will go further studies.