Optimization of step-edge substrates for high-TC superconducting devices

C. H. Wu; M. J. Chen; M. H. Hsu; J. C. Chen; K. L. Chen; J. H. Chen; J. T. Jeng; T. S. Lai; H. E. Horng; H. C. Yang

doi:10.1016/j.physc.2005.10.006

Optimization of step-edge substrates for high-T_C superconducting devices

C. H. Wu, M. J. Chen, M. H. Hsu, J. C. Chen, K. L. Chen, J. H. Chen, J. T. Jeng, T. S. Lai, H. E. Horng, H. C. Yang^*

^*Corresponding author for this work

Undergraduate Program of Electro-Optical Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

To pursue step-edge for high-T_C superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-T_C step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

Original language	English
Pages (from-to)	108-114
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	433
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physc.2005.10.006
Publication status	Published - 2005 Dec 1

Keywords

SQUID
Serial SQUID arrays
Step-edge

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2005.10.006

Cite this

@article{c9d42725b58d46428485ec4fb1abfc8c,

title = "Optimization of step-edge substrates for high-TC superconducting devices",

abstract = "To pursue step-edge for high-TC superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-TC step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.",

keywords = "SQUID, Serial SQUID arrays, Step-edge",

author = "Wu, {C. H.} and Chen, {M. J.} and Hsu, {M. H.} and Chen, {J. C.} and Chen, {K. L.} and Chen, {J. H.} and Jeng, {J. T.} and Lai, {T. S.} and Horng, {H. E.} and Yang, {H. C.}",

note = "Funding Information: The authors thank the financial supports of the Ministry of Education (91-N-FA01-2-4-2) and National Science Council of Taiwan (NSC93-2112-M002-041).",

year = "2005",

month = dec,

day = "1",

doi = "10.1016/j.physc.2005.10.006",

language = "English",

volume = "433",

pages = "108--114",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Optimization of step-edge substrates for high-TC superconducting devices

AU - Wu, C. H.

AU - Chen, M. J.

AU - Hsu, M. H.

AU - Chen, J. C.

AU - Chen, K. L.

AU - Chen, J. H.

AU - Jeng, J. T.

AU - Lai, T. S.

AU - Horng, H. E.

AU - Yang, H. C.

N1 - Funding Information: The authors thank the financial supports of the Ministry of Education (91-N-FA01-2-4-2) and National Science Council of Taiwan (NSC93-2112-M002-041).

PY - 2005/12/1

Y1 - 2005/12/1

N2 - To pursue step-edge for high-TC superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-TC step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

AB - To pursue step-edge for high-TC superconducting grain boundary junctions or SQUIDs with high reproducibility and quality, we have developed two-step procedures of fabricating very good step-edge substrates. A protocol of precisely controlling step angles for Josephson junctions has been established, with which we can predict the step angles as well as get a better control of the fabrication process. The procedures can improve the step ramp quality substantially. There are no needles, waves, trenches, cascade, or other flaws on these surfaces. The step substrates present good uniformity with respect to any step angle. We have characterized high-TC step-edge dc SQUIDs connected in series. The I-V curves of SQUID arrays show the RSJ behavior. The enhanced modulation amplitude of 110 μV is achieved at 77 K with the step-edge dc SQUID in series. The results clearly show the high uniformity and quality of the fabricated step-edge Josephson junctions.

KW - SQUID

KW - Serial SQUID arrays

KW - Step-edge

UR - http://www.scopus.com/inward/record.url?scp=28144441350&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28144441350&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2005.10.006

DO - 10.1016/j.physc.2005.10.006

M3 - Article

AN - SCOPUS:28144441350

SN - 0921-4534

VL - 433

SP - 108

EP - 114

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - 1-2

ER -