Abstract
In order to investigate the stability of HTS SQUIDs and SQIFs (arrays of SQUIDs with different loop size) based on YBCO bicrystal Josephson junctions we thermally cycled them in a controlled way 1000 times between 300 K and 77 K. The samples, which were partly covered with a Teflon protection layer, were electrically characterized after predetermined numbers of cycles. From these measurements the electrical parameters like critical current, normal resistance, maximum voltage modulation, width of the SQIF-peak and of the SQUID modulation, coupling inductance of the SQUID, and the maximum magnetic-field-to-voltage transfer factor were determined. Additionally, the critical current density of the YBCO-layers was determined.
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