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US4983575A
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Superconducting thin films made of stacked composite oxide layers
Assignee: Hitachi Ltd
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Filing: 1988-03-24
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Granted: 1991-01-08
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Expires: 2008-03-24
Abstract
Abstract A superconducting thin film obtained by laminating a Cu-O atomic pair film and another oxide film while growing in one direction shows a higher superconducting critical temperature (Tc). By alternately laminating a thin film of A2CuO4 and a thin film of L2CuO4, wherein A and L are different rare earth elements, the Tc can be enhanced remarkably.
Inventors
- 👤 Matahiro Komuro
- 👤 Yuzo Kozono
- 👤 Shinji Narishige
- 👤 Masanobu Hanazono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:10
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0408; C30; C30B; C30B23/00; C30B23/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/225; H10N60/0381; H10N60/20; H10N60/203; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/725; Y10S505/729
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A superconducting thin film comprising at least one layer of a Cu--O atomic pair film and a layer of an oxide film superposed on said Cu--O atomic pair film, and having a long range ordering and a uniform lattice strain, said oxide film being made of oxides of at least one element selected from the group consisting of Na, K, Be, Mg, Ca, Sr, Ba, Sc, Y, the lanthanide elements 57 to 71, Ti, Zr, V, Nb, In, Sn, Tl, Po, Ir, Bi and Pb, and a total thickness of said Cu--O atomic pair film and said oxide film being more than 11.3 Å but not greater than 1,000 Å.
Claim 2
Dependent Claim
110 words
A superconducting thin film comprising at least one layer of a Cu--O atomic pair film and a layer of an oxide film superposed on said Cu--O atomic pair film, and having a long range ordering and a uniform lattice strain, said oxide film being made of oxides of at least one element selected from the group consisting of Na, K, Be, Mg, Ca, Sr, Ba, Sc, Y, the lanthanide elements 57 to 71, Ti, Zr, V, Nb, In, Sn, Tl, Po, Ir, Bi and Pb, and a total thickness of said Cu--O atomic pair film and said oxide film being more than 11.3 Å but not greater than 1,000 Å.
Claim 3
Dependent Claim
33 words
A superconducting thin film according to claim 1, wherein at least a part of Cu is replaced by a face-centered cubic element selected from the group consisting of Ag, Au, Pd and Pt.
Claim 4
Dependent Claim
50 words
A superconducting material according to claim 1, wherein the another oxide film is a film of SrO 2 , CaO 2 , SnO 2 , Tl 2 O 3 , Bi 2 O 3 , Tm 2 O 3 , Yb 2 O 3 or Lu 2 O 3 .
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |