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An investigation was conducted of the characteristic features of the interaction of electromagnetic radiation with different YBaCuO thin films varying from granular to epitaxial. The current-voltage characteristics and the voltage response of these films to millimeter-wave radiation were measured at temperatures from 4 to 100 K. The behavior of these characteristics for granular and polycrystalline films can be accounted for by a percolation mechanism of conductivity in a two-dimensional system of weak links existing between granulas or grains of the films and having different values of critical currents. It is shown that with the improvement of film structure the mechanism of film interaction with electromagnetic radiation is changed from percolation in the system of weak links between grains to heating in grains of the films.>
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Afanasyev et al. (1989) studied this question.
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