Devices and systems based on novel superconducting material
AssigneeLucent Technologies Inc.
InventorsBertram Josef Batlogg, Robert Joseph Cava, Robert Bruce van Dover
Life of this patent
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Abstract
A class of superconductive materials containing copper-oxygen bonding and with mixed cation-occupancy designed with a view to size and valence consideration yield useful values of critical temperature and other properties. Uses entail all applications which involves superconducting materials such as magnets and transmission lines which require continuous superconductivity paths as well as detectors (e.g., which may rely on tunneling).
Claims18
Superconducting element comprising at least one composition which is at least one of the nominally quaternary or substituted quaternary copper oxides of the nominal formula M2M′Cu3O9−δ in which M ions are essentially divalent, M′ ions are essentially trivalent but are not solely Sc ions, and δ is numerically at least 1, wherein:
- divergence from the nominal formula amounts of M and M′ is a maximum of 10 at %;
- and at least 95 mole percent of said composition is of a single phase nominally of the perovskite structure and exhibits 0 electrical resistance at a temperature of 72° K. or above.
A crystalline single phase composition having a Perovskite-like structure, exhibiting 0 electrical resistance at a temperature of 72° K. or above, having the formula M′M2Cu3O9−d wherein M′ is Y, La, Eu, or Lu;
- M is Ba or a mixture of Ba and Sr;
- and d is at least 1 and is a value that provides the composition with 0 electrical resistance at a temperature of 72° K. or above.
A crystalline, essentially single phase composition having a Perovskite-like structure, exhibiting 0 electrical resistance at a temperature of 72° K. or above, having the formula M′M2Cu3O9−d wherein:
- (a) M′ is an element or combination of elements selected from the group consisting of Y, La, Eu, Lu, and Sc:
- (b) M′ is not solely Sc;
- (c) M is Ba or a mixture of Ba and Sr;
- (d) divergence from the nominal formula amounts of M and M′ is a maximum of 10 at. %;
- and
- (e) d is at least 1 and is a value that provides the composition with 0 electrical resistance at a temperature of 72° K. or above.
Dependencies are inferred from the claim text.