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VOLUME 28 (1978) | ISSUE 4 | PAGE 198
Nonlinearity of single-photon absorption in a superconductor near the threshold
Single-photon absorption of the electromagnetic field in a pure superconductor at finite amplitudes is considered. It is shown that near the threshold the absorption becomes nonlinear at ñ£ñÓË1/2[(Ê>-2ä)/ä]3/4, and that the nonlinearity leads to the appearance of the minimum on the amplitude characteristics and to a smoothing of the kink on the frequency characteristics at the threshold point.