PREPARATION AND PROPERTIES OF ALL HIGH-TC SNS-TYPE EDGE DC SQUIDS

High-T(c)SNS-type Josephson junctions and dc SQUIDs were successfully fabricated using hetero-epitaxially grown multilayers of YBa2Cu3O(x) and PrBa2Cu3O(x). These layers are c-axis oriented and hence edges of the multilayers give rise to a current flow in the ab-plane between the electrodes of a Josephson junction. The necessary structuring was done by Ar ion beam etching. The individual junctions exhibit a supercurrent up to 80 K. The I(c)R(n)-product of these junctions usually has a lower limit of 8 mV at 4.2 K. Voltage modulation of the first dc SQUIDs can be observed up to 66 K. At 4.2 K we investigated the voltage modulation for various bias currents and also performed noise measurements. Details on the fabrication and measurements are presented.