Interaction of electrons with thermal phonons in YBa2Cu3O7-δ films at low temperatures
Aksaev E. E. , Gershenzon E. M., Gol'tsman G. N. , Semenov A. D. , Sergeev A. V.
The time of the electron-phonon coupling, τ h, in YBaCuO films, a measure of the relaxation time of the resistance of a superconductor in the resistive state, has been determined from the radiation-induced increase of the resistance at low temperatures. The fitted results obtained by these methods show that the relaxation of the resistance in the resistive state is attributable to the cooling of the electron subsystem relative to the phonon subsystem. The time reph, inversely proportional to the temperature, was found to be 80 ps at 7" = 1.6 ë and 5 ps at T= 30 K.