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Title: 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 A
Application Number:
PPN: US 7-949098
Assignee:
Sandia Corp., Albuquerque, NM (United States) SNL; EDB-94-171955
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}
}