Planar squid of oxide superconductor
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakashi Matsuura, Hideo Itozaki
Life of this patent
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Abstract
A SQUID comprises a substrate, a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole, and a Josephson junction which connects portions of the washer at the both sides of the slit across the slit. In the SQUID, the ratio of similarity of the washer to the hole ranges 100 to 2500.
Claims20
A SQUID comprising:
- a substrate;
- a rectangular washer of an oxide superconductor thin film disposed on a surface of the substrate and having a hole therein and a slit through a side of the washer;
- and
- a connecting member including at least one Josephson junction, the connecting member connecting portions of the washer across the slit,
- wherein an outer dimensional length of one side of the rectangular washer is at least 100 times greater than a length of a corresponding side of the hole in the washer.
A SQUID comprising;
- a substrate;
- a washer of an oxide superconductor thin film on a principal surface of the substrate with a hole therein having a shade similar to that of the washer;
- a slit in one side of the washer and reaching to the hole;
- and
- at least one Josephson junction by which portions of the washer at both sides of the slit are connected across the slit,
- wherein a ratio of a side length of the washer to a corresponding side length of the hole is at least 100.
A SQUID as claimed in claim 16, wherein the portions of the washer connected across the slit, comprise two tongue portions.
A SQUID comprising:
- a substrate having a substantially planar surface and a hexahedron concavity on the surface;
- a square washer having two tongue portions of an oxide superconductor thin film on the surface of the substrate and having a square hole in the washer;
- a slit formed in the washer between the tongue portions to the hole;
- and
- a member of an oxide superconductor thin film including two Josephson junctions connected in series, which connects the two tongue portions across the slit, wherein
- a ratio of a length of a side of the washer to a length of a corresponding side of the hole is 500, and
- the Josephson junctions are constituted of grain boundaries of the oxide superconductor at steps between the surface of the substrate and a bottom of the concavity.
Dependencies are inferred from the claim text.