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^*

^*此作品的通信作者

光電工程學士學位學程

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

7 引文斯高帕斯（Scopus）

摘要

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.

原文	英語
頁（從 - 到）	108-114
頁數	7
期刊	Physica C: Superconductivity and its applications
卷	433
發行號	1-2
DOIs	https://doi.org/10.1016/j.physc.2005.10.006
出版狀態	已發佈 - 2005 12月 1

ASJC Scopus subject areas

電子、光磁材料
凝聚態物理學
能源工程與電力技術
電氣與電子工程

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10.1016/j.physc.2005.10.006

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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",

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day = "1",

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

language = "English",

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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

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

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ASJC Scopus subject areas

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