Abstract
We will report structural and electrical properties of bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7, created at predetermined locations by controlling the in-plane epitaxy of YBa2Cu3O7 with a seea layer and a buffer layer on a base layer. Reproducibility and uniformity of the junctions is described. SQUIDs made from bi-epitaxial junctions show voltage modulation at 77 K with reasonably low noise. Complete magnetometers coupled with multi-turn flux transformers have magnetic field sensitivity at 77 K sufficient to be useful for many applications. Recent success in fabricating integrated SQUIDs by combining the SQUID and multi-turn flux transformer on a single substrate is described.
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