Intrinsic Josephson junctions and random telegraph voltage fluctuators in granular HTSC thin films

Bias current that renders symmetric random telegraph voltage noise signals in granular YBaCuO films was found to be a nonlinear function of the applied magnetic field. It has been proposed that intrinsic Josephson inductance is responsible for the observed nonlinearity. The analysis concludes that a Josephson element enclosed in a superconducting loop is likely involved in the random telegraph voltage noise generation. The evaluated area of the loop is consistent with the free space between average grains in the investigated sample.