High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O
A process is disclosed for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO[sub 3] crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O[sub 3], followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry. 8 figs.
- DOE Contract Number:
- AC04-76DP00789
- Assignee:
- Sandia Corp., Albuquerque, NM (United States)
- Patent Number(s):
- US 5358928; A
- Application Number:
- PPN: US 7-949098
- OSTI ID:
- 6846815
- Resource Relation:
- Patent File Date: 22 Sep 1992
- Country of Publication:
- United States
- Language:
- English
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Tl-Ca-Ba-Cu-O step-edge Josephson junctions
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
JOSEPHSON JUNCTIONS
FABRICATION
ALUMINIUM OXIDES
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
DESIGN
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
THALLIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
JUNCTIONS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
665412* - Superconducting Devices- (1992-)