US3702956A
Expired / Lapsed
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Josephson junctions
Assignee: Air Liquide SA
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Filing: 1971-04-07
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Granted: 1972-11-14
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Expires: 1991-04-07
Abstract
Abstract The invention relates to a Josephson type junction and, according to the invention, this is constituted by a layer 1 of semiconducting material inserted between two superconductors 2 and 3. These superconductors are chosen such that the Fermi level of these superconductors falls at the location of the contact with the semiconductor material externally of the forbidden gap of the said semi-conductor. Junctions according to the invention may be used in high frequency current techniques when a D.C. voltage is applied, thus permitting the manufacture of generators or receivers operating at high frequency.
Inventors
- 👤 Michel Renard
- 👤 Philippe Cardinne
- 👤 Bernard Manhes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:51
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/44; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0912; H10N60/10; H10N60/12; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/873; Y10S505/874
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
51 words
A junction of the Josephson type comprising two members of superconductive metal, and between said members a layer of semiconductor material such that the Fermi level of the superconductive metal drops at the location of the contact with the semi-conductor material externally of the forbidden gap of the said semi-conductor material.
Claim 2
Dependent Claim
51 words
A junction of the Josephson type comprising two members of superconductive metal, and between said members a layer of semiconductor material such that the Fermi level of the superconductive metal drops at the location of the contact with the semi-conductor material externally of the forbidden gap of the said semi-conductor material.
Claim 3
Dependent Claim
24 words
A junction according to claim 1, wherein the extraction potential of the superconductive metal is greater than the extraction potential of the semi-conductor material.
Claim 4
Dependent Claim
37 words
A junction accordinG to claim 1, wherein the extraction potential of the superconductive metal is lower than the extraction potential of the semi-conductor material decreased by the energy of the forbidden gap of the said semi-conductor material.
Claim 5
Dependent Claim
27 words
A junction according to claim 1, wherein the thickness of the semi-conductor layer between the members made of superconductive metal is between 100 A and 1,000 A.
Claim 6
Dependent Claim
43 words
A junction according to claim 1, wherein said semi-conductive layer is tellurium (Te) and said superconductive members are a metal selected from the group consisting of lanthanum (La), lead (Pb), niobium (Nb), tin (Sn), tantalum (Ta), vanadium (V), rhenium (Re) and thallium (Tl).
Claim 7
Dependent Claim
23 words
A junction according to claim 1, wherein said semi-conductor layer is Selenium Beta (Se Beta ), and said superconductive members are lanthanum (La).
Claim 8
Dependent Claim
44 words
A junction according to claim 1, wherein said semi-conductor layer is an Na3Sb alloy and said superconductive members are a metal selected from the group consisting of lanthanum (La), lead (Pb), niobium (Nb), tin (Sn), tantalum (Ta), vanadium (V), rhenium (Re) and thallium (Tl).
Claim 9
Dependent Claim
33 words
A junction according to claim 1, wherein said semi-conductor layer is a Ga As alloy, and said superconductive members are a metal selected from the group consisting of lanthanum (La) and rhenium (Re).
Claim 10
Dependent Claim
42 words
A junction according to claim 1, wherein said semi-conductor layer is an InSb alloy, and said superconductive members are a metal selected from the group consisting of lanthanum (La), lead (Pb), tin (Sn), tantalum (Ta), vanadium (V), rhenium (Re) and thallium (Tl).
Claim 11
Dependent Claim
40 words
A junction according to claim 1, wherein said semi-conductor layer is silicon carbide (SiC) and said superconductive members are a metal selected from the group consisting of lanthanum (La), lead (Pb), tin (Sn), vanadium (V), thallium (Tl) and niobium (Nb).
Claim 12
Dependent Claim
21 words
A junction according to claim 1, wherein said semi-conductor layer is nickel oxide (NiO) and said superconductive members are rhenium (Re).
Claim 13
Dependent Claim
44 words
A junction according to claim 1, wherein said semi-conductor layer is a PbTe alloy and said superconductive members are a metal selected from the group consisting of lanthanum (La), lead (Pb), niobium (Nb), tin (Sn), tantalum (Ta), vanadium (V), rhenium (Re) and thallium (Tl).
Claim 14
Dependent Claim
35 words
A junction according to claim 1, wherein said semi-conductor layer is germanium (Ge), and said superconductive members are a metal selected from the group consisting of lanthanum (La), tin (Sn), rhenium (Re) and thallium (Tl).
Claim 15
Dependent Claim
17 words
A junction according to claim 4, wherein said semi-conductor layer has a lateral overflow of increasing thickness.
Claim 16
Dependent Claim
19 words
A junction according to claim 14, wherein the variation of thickness of said extension is constant per unit length.
Claim 17
Dependent Claim
22 words
A junction according to claim 14, wherein the increase in thickness at the location of the lateral overflow is about one hundredfold.
Claim 18
Dependent Claim
17 words
A junction according to claim 1, wherein said superconductive members and said semi-conductor layer are vapor deposited.
Claim 19
Dependent Claim
19 words
A junction according to claim 1, wherein said superconductive members and said semi-conductor layer are deposited by cathodic sputtering.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |