@article{41d40c760ed3418d8acd2dacb48d22c1,
title = "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 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.",
author = "Taisuke Kageura and Masakuni Hideko and Ikuto Tsuyuzaki and Aoi Morishita and Akihiro Kawano and Yosuke Sasama and Takahide Yamaguchi and Yoshihiko Takano and Minoru Tachiki and Shuuichi Ooi and Kazuto Hirata and Shunichi Arisawa and Hiroshi Kawarada",
note = "Funding Information: We would like to acknowledge technical assistance received from the NIMS Nanofabrication Platform, especially from H. Osato and E. Watanabe. This work was supported by a Grant-in-Aid for Scientific Research (S) (Grant Number 26220903), Grant-in-Aid for Scientific Research (B) (Grant Number 17H03526), and Grant-in-Aid for Research Activity start-up (Grant number 17H07192) from the Japan Society for the Promotion of Science (JSPS). Part of this study was supported by the NIMS Nanofabrication Platform in Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and Project of Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development of MEXT. We would also like to thank Tiffany Jain, M.S., from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript. Publisher Copyright: {\textcopyright} 2019, The Author(s).",
year = "2019",
month = dec,
day = "1",
doi = "10.1038/s41598-019-51596-w",
language = "English",
volume = "9",
journal = "Scientific reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",
}