High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

Ginley, David S; Hietala, Vincent M; Hohenwarter, Gert K. G.; Martens, Jon S; Plut, Thomas A; Tigges, Chris P; Vawter, Gregory A; Zipperian, Thomas E

High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

Patent · Tue Oct 25 04:00:00 EDT 1994

OSTI ID:869576

Ginley, David S ^[1]; Hietala, Vincent M ^[2]; Hohenwarter, Gert K. G. ^[3]; Martens, Jon S ^[4]; Plut, Thomas A ^[5]; Tigges, Chris P ^[5]; Vawter, Gregory A ^[5]; Zipperian, Thomas E ^[5]

Evergreen, CO
Placitas, NM
Madison, WI
Sunnyvale, CA
Albuquerque, NM

A process 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.

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Research Organization:: AT & T CORP

DOE Contract Number:: AC04-76DP00789

Assignee:: Sandia Corporation (Albuquerque, NM)

Patent Number(s):: US 5358928

Application Number:: 07/949,098

OSTI ID:: 869576

Country of Publication:: United States

Language:: English

References (14)

Tl‐Ca‐Ba‐Cu‐O step‐edge Josephson junctions Martens, J. S.; Zipperian, T. E.; Vawter, G. A. Applied Physics Letters, Vol. 60, Issue 9 https://doi.org/10.1063/1.107458	journal	March 1992
Principles of Superconductive Devices and Circuits Van Duzer, T.; Turner, C. W.; McDonald, D. G. Physics Today, Vol. 35, Issue 2 https://doi.org/10.1063/1.2914944	journal	February 1982
Ideal tunneling characteristics in Ba _{1− x} K _x BiO ₃ point‐contact junctions with Au and Nb tips Huang, Qiang; Zasadzinski, J. F.; Gray, K. E. Applied Physics Letters, Vol. 57, Issue 22 https://doi.org/10.1063/1.104172	journal	November 1990
Orientation Dependence of Grain-Boundary Critical Currents in Y Ba 2 Cu 3 O 7 − δ Bicrystals Dimos, D.; Chaudhari, P.; Mannhart, J. Physical Review Letters, Vol. 61, Issue 2 https://doi.org/10.1103/PhysRevLett.61.219	journal	July 1988
Quantum limited quasiparticle mixers at 100 GHz Mears, C. A.; Hu, Q.; Richards, P. L. IEEE Transactions on Magnetics, Vol. 27, Issue 2 https://doi.org/10.1109/20.133934	journal	March 1991
High-speed Josephson processor technology Hasuo, S.; Kotani, S.; Inoue, A. IEEE Transactions on Magnetics, Vol. 27, Issue 2 https://doi.org/10.1109/20.133748	journal	March 1991
Fabrication of TlCaBaCuO step‐edge Josephson junctions with hysteretic behavior Martens, J. S.; Hietala, V. M.; Zipperian, T. E. Applied Physics Letters, Vol. 60, Issue 8 https://doi.org/10.1063/1.106506	journal	February 1992
Practical high T _c Josephson junctions and dc SQUIDs operating above 85 K Di Iorio, M. S.; Yoshizumi, S.; Yang, K‐Y. Applied Physics Letters, Vol. 58, Issue 22 https://doi.org/10.1063/1.105231	journal	June 1991
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Morphology control and high critical currents in superconducting thin films in the Tl-Ca-Ba-Cu-O system Ginley, D. S.; Kwak, J. F.; Venturini, E. L. Physica C: Superconductivity, Vol. 160, Issue 1 https://doi.org/10.1016/0921-4534(89)90450-4	journal	August 1989
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/505/257/427/
ability
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adding
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covering
crystal
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laalo
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maintaining
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step-edge
step-etching
subsequent
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temperatures
ti-ca-ba-cu-o
titanium
tlcabacuo
uniformity

High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

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