Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure
Abstract Superconducting quantum interference devices (SQUIDs) are currently used as magnetic flux detectors with ultra-high sensitivity for various applications such as medical diagnostics and magnetic material microstructure analysis. Single-crystalline superconducting boron-doped diamond is an ex...
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Nature Portfolio
2019
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oai:doaj.org-article:84793a3f5f8e4bd3bf7e68ce85b1f11c2021-12-02T15:09:37ZSingle-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure10.1038/s41598-019-51596-w2045-2322https://doaj.org/article/84793a3f5f8e4bd3bf7e68ce85b1f11c2019-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-51596-whttps://doaj.org/toc/2045-2322Abstract Superconducting quantum interference devices (SQUIDs) are currently used as magnetic flux detectors with ultra-high sensitivity for various applications such as medical diagnostics and magnetic material microstructure analysis. Single-crystalline superconducting boron-doped diamond is an excellent candidate for fabricating high-performance SQUIDs because of its robustness and high transition temperature, critical current density, and critical field. Here, we propose a fabrication process for a single-crystalline boron-doped diamond Josephson junction with regrowth-induced step edge structure and demonstrate the first operation of a single-crystalline boron-doped diamond SQUID above 2 K. We demonstrate that the step angle is a significant parameter for forming the Josephson junction and that the step angle can be controlled by adjusting the microwave plasma-enhanced chemical vapour deposition conditions of the regrowth layer. The fabricated junction exhibits superconductor–weak superconductor–superconductor-type behaviour without hysteresis and a high critical current density of 5800 A/cm2.Taisuke KageuraMasakuni HidekoIkuto TsuyuzakiAoi MorishitaAkihiro KawanoYosuke SasamaTakahide YamaguchiYoshihiko TakanoMinoru TachikiShuuichi OoiKazuto HirataShunichi ArisawaHiroshi KawaradaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) |
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Medicine R Science Q |
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Medicine R Science Q Taisuke Kageura Masakuni Hideko Ikuto Tsuyuzaki Aoi Morishita Akihiro Kawano Yosuke Sasama Takahide Yamaguchi Yoshihiko Takano Minoru Tachiki Shuuichi Ooi Kazuto Hirata Shunichi Arisawa Hiroshi Kawarada Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| description |
Abstract Superconducting quantum interference devices (SQUIDs) are currently used as magnetic flux detectors with ultra-high sensitivity for various applications such as medical diagnostics and magnetic material microstructure analysis. Single-crystalline superconducting boron-doped diamond is an excellent candidate for fabricating high-performance SQUIDs because of its robustness and high transition temperature, critical current density, and critical field. Here, we propose a fabrication process for a single-crystalline boron-doped diamond Josephson junction with regrowth-induced step edge structure and demonstrate the first operation of a single-crystalline boron-doped diamond SQUID above 2 K. We demonstrate that the step angle is a significant parameter for forming the Josephson junction and that the step angle can be controlled by adjusting the microwave plasma-enhanced chemical vapour deposition conditions of the regrowth layer. The fabricated junction exhibits superconductor–weak superconductor–superconductor-type behaviour without hysteresis and a high critical current density of 5800 A/cm2. |
| format |
article |
| author |
Taisuke Kageura Masakuni Hideko Ikuto Tsuyuzaki Aoi Morishita Akihiro Kawano Yosuke Sasama Takahide Yamaguchi Yoshihiko Takano Minoru Tachiki Shuuichi Ooi Kazuto Hirata Shunichi Arisawa Hiroshi Kawarada |
| author_facet |
Taisuke Kageura Masakuni Hideko Ikuto Tsuyuzaki Aoi Morishita Akihiro Kawano Yosuke Sasama Takahide Yamaguchi Yoshihiko Takano Minoru Tachiki Shuuichi Ooi Kazuto Hirata Shunichi Arisawa Hiroshi Kawarada |
| author_sort |
Taisuke Kageura |
| title |
Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| title_short |
Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| title_full |
Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| title_fullStr |
Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| title_full_unstemmed |
Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| title_sort |
single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure |
| publisher |
Nature Portfolio |
| publishDate |
2019 |
| url |
https://doaj.org/article/84793a3f5f8e4bd3bf7e68ce85b1f11c |
| work_keys_str_mv |
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