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EP0422407A2
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Multilayer distorted-lattice copper-oxide perovskite structures
Assignee: International Business Machines Corp
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Filing: 1990-09-14
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Granted: —
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Expires: 2010-09-14
Abstract
Abstract The present invention discloses a multilayered structure comprising copper-oxide perovskite material having strained crystallographic lattices and altered superconductive properties. The layers are adjacent to one another in an epitaxial lattice-distortion relationship. Normal and superconductive state parameters vary with the layers due to distortion of the unit cell dimensions.
Inventors
- 👤 Gupta Arunava
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:15
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0521; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4508; H10N60/80; H10N60/85; H10N60/855; H10N60/857; H10N60/858; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
313 words
A multilayer structure comprising at least one first layer of a first copper-oxide perovskite material and at least one second layer of a second copper-oxide perovskite material which is adjacent to the first layer in an epitaxial lattice-distortion relationship, the first copper-oxide perovskite material being different from the second copper-oxide perovskite material, the first copper-oxide perovskite material in an unstressed bulk state defining a first comparison nondistorted crystallagraphic lattice structure having first comparison nondistorted unit cell dimensions, the first copper-oxide perovskite material in the unstressed bulk state exhibiting normal and superconductive states which define a set of comparison normal/superconducting transition parameters, the second copper-oxide perovskite material in an unstressed bulk state defining a second comparison nondistorted crystallographic lattice structure having second comparison nondistorted unit cell dimensions, the second comparison nondistorted unit cell dimensions differing from the first comparison nondistorted unit cell dimensions in at least one dimension, the first copper-oxide perovskite material in the at least one first layer having a first crystallographic lattice structure having first unit cell dimensions, the first crystallographic lattice structure being distorted relative to the first comparison nondistorted crystallographic lattice structure with at least one first unit cell dimension differing by a lattice-distortion amount from a corresponding first comparison nondistorted unit cell dimension, the first copper-oxide perovskite material in at least one first layer exhibiting normal and superconductive states which define a set of normal/superconducting transition parameters, at least one of the normal/superconducting transition parameters differing by a lattice-distortion amount from a corresponding comparison normal/superconducting transition parameter, the second copper-oxide perovskite material in the at least one second layer having a second crystallographic lattice structure having second unit cell dimensions, the second crystallographic lattice structure being distorted relative to the second comparison nondistorted crystallographic lattice structure with at least one first unit cell dimension differing by a lattice-distortion amount from a corresponding second comparison nondistorted unit cell dimension.
Claim 2
Dependent Claim
313 words
A multilayer structure comprising at least one first layer of a first copper-oxide perovskite material and at least one second layer of a second copper-oxide perovskite material which is adjacent to the first layer in an epitaxial lattice-distortion relationship, the first copper-oxide perovskite material being different from the second copper-oxide perovskite material, the first copper-oxide perovskite material in an unstressed bulk state defining a first comparison nondistorted crystallagraphic lattice structure having first comparison nondistorted unit cell dimensions, the first copper-oxide perovskite material in the unstressed bulk state exhibiting normal and superconductive states which define a set of comparison normal/superconducting transition parameters, the second copper-oxide perovskite material in an unstressed bulk state defining a second comparison nondistorted crystallographic lattice structure having second comparison nondistorted unit cell dimensions, the second comparison nondistorted unit cell dimensions differing from the first comparison nondistorted unit cell dimensions in at least one dimension, the first copper-oxide perovskite material in the at least one first layer having a first crystallographic lattice structure having first unit cell dimensions, the first crystallographic lattice structure being distorted relative to the first comparison nondistorted crystallographic lattice structure with at least one first unit cell dimension differing by a lattice-distortion amount from a corresponding first comparison nondistorted unit cell dimension, the first copper-oxide perovskite material in at least one first layer exhibiting normal and superconductive states which define a set of normal/superconducting transition parameters, at least one of the normal/superconducting transition parameters differing by a lattice-distortion amount from a corresponding comparison normal/superconducting transition parameter, the second copper-oxide perovskite material in the at least one second layer having a second crystallographic lattice structure having second unit cell dimensions, the second crystallographic lattice structure being distorted relative to the second comparison nondistorted crystallographic lattice structure with at least one first unit cell dimension differing by a lattice-distortion amount from a corresponding second comparison nondistorted unit cell dimension.
Claim 3
Dependent Claim
45 words
The multilayer structure according to claim 1 in which at least one of the first and the second comparison nondistorted crystallographic lattice structures is an orthorhombic structure and the other of the first and the second comparison nondistorted crystallographic lattice structure is a tetragonal structure.
Claim 4
Dependent Claim
22 words
The multilayer structure according to claim 1 in which both the first and the second crystallographic lattice structures are essentially tetragonal structures.
Claim 5
Dependent Claim
32 words
The multilayer structure according to claim 2 in which the first copper-oxide perovskite material is an yttrium barium copper oxide and the second copper-oxide perovskite material is a neodymium cerium copper oxide.
Claim 6
Dependent Claim
54 words
The multilayer structure according to claim 2 in which the first copper-oxide perovskite material is YBa₂Cu₃O 7-δ and the second copper-oxide perovskite material is a neodymium cerium copper oxide, the thickness of the first layer being about 20 nm or less and the thickness of the second layer being about 20 nm or less.
Claim 7
Dependent Claim
49 words
The multilayer structure according to any one of the preceding claims comprising a plurality of first layers of the first copper-oxide perovskite material and a like plurality of second layers of the second copper-oxide perovskite material, the first and the second layers being arranged in an alternating side-by-side arrangement.
References Cited (Backward Citations)
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