PROPERTIES OF HIGH-T-C MICROBRIDGE WITH 2-DIMENSIONAL ARRAYS OF DIFFUSION WEAK LINKS

YBaCuO microbridges with two-dimensional arrays of superconducting isl ands connected by diffusion-type weak links have been made and investi gated experimentally. The basic structure is a microbridge patterned i n a laser deposited YBaCuO thin film. On top of the microbridge a subm icron rectangular mesh of 70 nm wide aluminium strips was deposited an d subsequently diffused at 300-400 degrees C forming weak links. The a rrays were 10 mu m long and their width varied between 4 and 8 mu m wi th 500 X 500 nm(2) or 800 x 800 nm(2) unit cells. The critical current and I-V curves depend nonmonotonically on magnetic field due to the m ultiply connected nature of the bridge. Microwave radiation from the b ridge has been registered with an external receiver. The experimental data could be explained by the vortex motions under the Lorenz force w ith the magnetic radius larger than the cell size.