Phonon spectra in superconducting ceramics

Abstract

A model based on the continual deformation of mass distribution by sputtering of thin films is formed. Presented theory shows that due to mass deformation acoustical phonons are eliminated which causes a higher critical superconductive temperatures. The theory and experimental data for ceramic oxides are in good agreement. Presented theory should serve the synthesis of new superconductive materials. Some general considerations concerning specificity of phonon spectra in thin films are also exposed. © 1990 IOP Publishing Ltd.