High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O
Abstract
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.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 6846815
- Patent Number(s):
- 5358928
- Application Number:
- PPN: US 7-949098
- Assignee:
- Sandia Corp., Albuquerque, NM (United States)
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 22 Sep 1992
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, 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-)
Citation Formats
Ginley, D S, Hietala, V M, Hohenwarter, G K.G., Martens, J S, Plut, T A, Tigges, C P, Vawter, G A, and Zipperian, T E. High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O. United States: N. p., 1994.
Web.
Ginley, D S, Hietala, V M, Hohenwarter, G K.G., Martens, J S, Plut, T A, Tigges, C P, Vawter, G A, & Zipperian, T E. High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O. United States.
Ginley, D S, Hietala, V M, Hohenwarter, G K.G., Martens, J S, Plut, T A, Tigges, C P, Vawter, G A, and Zipperian, T E. Tue .
"High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O". United States.
@article{osti_6846815,
title = {High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O},
author = {Ginley, D S and Hietala, V M and Hohenwarter, G K.G. and Martens, J S and Plut, T A and Tigges, C P and Vawter, G A and Zipperian, T E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {10}
}