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US5324714A
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Growth of a,b-axis oriented perovskite thin films over a buffer/template layer
Assignee: University of Maryland, College Park
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Filing: 1993-05-19
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Granted: 1994-06-28
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Expires: 2013-05-19
Abstract
Abstract A method, and the resulting structure, of growing a superconducting perovskite thin film of, for example, YBa2Cu3O7-x. A buffer layer of, for example, the perovskite PrBa2Cu3O7-y, is grown on a crystalline (001) substrate under conditions which favor growth of a,b-axis oriented material. Then the YBa2Cu3O7-x layer is deposited on the buffer layer under changed growth conditions that favor growth of c-axis oriented material on the substrate, for example, the substrate temperature is raised by 110 DEG C. However, the buffer layer acts as a template that forces the growth of a,b-axis YBa2Cu3O7-x, which nonetheless shows a superconducting transition temperature near that of c-axis oriented films.
Inventors
- 👤 Arun Inam
- 👤 Ramamoorthy Ramesh
- 👤 Charles T. Rogers, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:57
CPC Classifications
C; C30; C30B; C30B23/00; C30B23/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/225; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0521; H10N60/0576; H10N60/0632; H10N60/0912; H10N60/0941; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/725; Y10S505/729; Y10S505/73; Y10S505/732
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
42 words
A superconducting heterostructure, comprising: a crystalline substrate; a buffer layer of an a,b-axis oriented praseodymium lanthanide rare-earth barium cuprate epitaxially formed over said substrate; and a superconducting layer of an a,b-axis oriented lanthanide rare-earth barium cuprate epitaxially formed over said buffer layer.
Claim 2
Dependent Claim
42 words
A superconducting heterostructure, comprising: a crystalline substrate; a buffer layer of an a,b-axis oriented praseodymium lanthanide rare-earth barium cuprate epitaxially formed over said substrate; and a superconducting layer of an a,b-axis oriented lanthanide rare-earth barium cuprate epitaxially formed over said buffer layer.
Claim 3
Dependent Claim
58 words
A superconducting heterostructure as recited in claim 1, further comprising: a barrier layer of an a,b-axis oriented perovskite epitaxially formed over said superconducting layer; and a second superconducting layer of an a,b-axis oriented lanthanide rare-earth barium cuprate epitaxially formed over said barrier layer, wherein a superconducting weak link is formed between said superconducting layers across said barrier layer.
Claim 4
Dependent Claim
40 words
A superconducting heterostructure, as recited in claim 2, wherein said first and second superconducting layers comprise YBa 2 Cu 3 O 7-x and said buffer layer comprises Pr 1-z Y 2 Ba 2 Cu 3 O 7-y , wherein 0≦z<1.
Claim 5
Dependent Claim
19 words
A superconducting heterostructure, as recited in claim 2, wherein said barrier layer comprises a praseodymium lanthanide rare-earth barium cuprate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |