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Mr. SQUID User’s Guide
top of a grain boundary in a specially prepared substrate. The substrate was a ‘bi-crystal,”
created by fusing together two crystals with different orientations. Such a process cannot be
extended to integrated circuits or to large-scale manufacturing, but at present it has resulted in
the most sensitive YBCO SQUIDs ever produced and is the junction technology employed in the
manufacture of Mr. SQUID® since early 1996.
Fused crystal boundary
Superconductor
region 1
region 2
Substrate
Figure 5-12 Schematic of bicrystal grain boundary Josephson junction showing the relationship
between the fused substrate and relative orientations of the two regions of the YBCO film.
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