Abstract
The results of YBa2Cu3O7-x films on SrTiO3 investigation by far infrared surface electromagnetic waves (SEW) amplitude and phase spectroscopy at temperatures 80-350 K are presented. Strong SEW absorption at frequency 140 cm-1 has been observed. The origin of the observed absorption is proposed to be concerned with slab-phonons in YBa2Cu3O7-x. The optical constants of the films have been obtained. The complex SEW refraction index on temperature is explained, taking into account 'soft modes' features in SrTiO3 substrate. It has been determined that only the imaginary part of the SEW refraction index changes when the film transits into superconducting state, while the real part remains unchanged.
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