Abstract
The investigation of the spatial current distribution in high-Tc thin filin Josephson junctions is a key problem in understanding their electrical behaviour from the point of view of physics as well as for using them in practical applications for example in dc-SQUIDs which became suitable for a wide range of measurement tasks such as nondestructive material testing or in biomagnetism. We prepared different types of Josephson junctions based on YBa2Cu3O7–x (YBCO) thin films on SrTiO3 substrates like step-edge junctions, bicrystal junctions, and ion beam modified microbridges. A special optimized ion beam etching (IBE) process was not only used to prepare the superconducting structures but also to investigate the dependence of electrical junction behaviour on filin thickness by means of thinning the junctions thickness. In this way the ion beam thinning process was used to modify Josephson junctions and especially dc-SQUIDs after their preparation to adjust then to special working conditions.
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