US5358926A
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Epitaxial thin superconducting thallium-based copper oxide layers
Assignee: Clearday Inc
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Filing: 1993-07-29
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Granted: 1994-10-25
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Expires: 2013-07-29
Abstract
Abstract Novel articles are provided of thin super-conductive thallium-based copper oxide layers on inorganic, usually crystalline substrates. Novel methods are provided for ease of producing such articles, particularly involving sol-gel techniques and laser ablation. The articles have a highly oriented superconductive thallium-based copper oxide film, particularly epitaxial, with high superconductive transition temperatures and desirable electrical properties. The subject articles find use in a wide variety of electronic applications, particularly in microwave and millimeter wave devices.
Inventors
- 👤 William L. Olson
- 👤 Michael M. Eddy
- 👤 Robert B. Hammond
- 👤 Timothy W. James
- 👤 McDonald Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:02
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0521; H10N60/0548; H10N60/20; H10N60/203; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/725; Y10S505/734; Y10S505/735
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
64 words
A superconducting article comprising an oriented, epitaxial superconducting layer of thallium, optionally calcium, barium and copper oxide on a crystalline substrate, said layer being at least 30 Å thick, and having a c-axis oriented normal to the crystalline substrate surface and being epitaxial to the substrate in that the a and b axes of the layer are at a fixed relationship to the substrate.
Claim 2
Dependent Claim
64 words
A superconducting article comprising an oriented, epitaxial superconducting layer of thallium, optionally calcium, barium and copper oxide on a crystalline substrate, said layer being at least 30 Å thick, and having a c-axis oriented normal to the crystalline substrate surface and being epitaxial to the substrate in that the a and b axes of the layer are at a fixed relationship to the substrate.
Claim 3
Dependent Claim
15 words
A superconducting article according to claim 1, wherein said superconducting layer has the 2122 composition.
Claim 4
Dependent Claim
15 words
A superconducting article according to claim 1, wherein said superconducting layer has the 2223 composition.
Claim 5
Dependent Claim
17 words
A superconducting article according to claim 1, wherein said substrate is magnesium oxide or yttria stabilized zirconia.
Claim 6
Dependent Claim
18 words
A microwave or millimeter device comprising an article according to any of claims 1, 2, 3 and 4.
Claim 7
Dependent Claim
18 words
The superconducting article of claim 1 wherein the layer thickness is less than or equal to 2 microns.
Claim 8
Dependent Claim
15 words
The superconducting article of claim 1 wherein the crystalline substrate consists of a single crystal.
Claim 9
Dependent Claim
14 words
The superconducting article of claim 1 wherein the substrate is lanthanum aluminate or sapphire.
Claim 10
Dependent Claim
28 words
The superconducting article of claim 1 wherein the epitaxial superconductor measures at least 3 millimeters in the smallest dimension in the a and b directions of the layer.
Claim 11
Dependent Claim
29 words
The superconducting article of claim 9 wherein the epitaxial superconducting layer measures at least 5 millimeters in the smallest dimension in the a and b axes of the layer.
Claim 12
Dependent Claim
14 words
The microwave or millimeter device of claim 5 wherein the device includes a resonator.
Claim 13
Dependent Claim
15 words
The microwave or millimeter device of claim 5 wherein the device includes a delay line.
Claim 14
Dependent Claim
25 words
The superconducting article of claim 1 wherein the surface resistance is less than or equal to 10 -3 ohms at 10 GHz at 77 K.
Claim 15
Dependent Claim
25 words
The superconducting article of claim 13 wherein the surface resistance is less than or equal to 10 -4 ohms at 10 Ghz at 77 K.
Claim 16
Dependent Claim
28 words
The superconducting article of claim 1 wherein the epitaxial superconductor measures at least 0.5 millimeters in the smallest dimension in the a and b directions of the layer.
References Cited (Backward Citations)
No citation records indexed.
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| 3.5 Years (Year 4) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |