J. Kolacek et al., THE COMPARISON OF FAR-INFRARED TRANSMISSION MEASUREMENTS ON THE YBACUO THIN-FILM WITH BIPOLARON AND BCS THEORY PREDICTIONS, Physica. C, Superconductivity, 235, 1994, pp. 1105-1106
Temperature dependence of the transmission coefficient of the YBaCuO t
hin film for several frequencies between 0.7 to 4.9 THz are presented.
Interpretation in the frame of both, the bipolaron and the BCS theori
es are given, however, a satisfactory agreement has not been achieved.