Non-equilibrium microwave response of YBa2Cu3O7-delta granular thin films under magnetic fields

Microwave responses of YBa2Cu3O7-delta (YBCO) granular film have been studi ed at the microwave frequency of 30.5 GHz. In the absence of a magnetic hel d the dependence of a normal microwave response on the bias current is obse rved at a temperature close to T-c. When a magnetic field ranged from 5.0 m T to 33.0 mT is applied, the responses broaden and shift toward a lower tem perature. In the superconducting state, the responses were found to be high ly dependent on the magnetic field. For the current equal to 5.0 mA and a m agnetic field above 17.0 mT the response increases and did not vanish even at a very low temperature, the fact is believed to be correlated to the ani sotropic character of the structure.