@article{5801cb658bfa4d86a01068de35e04786,
title = "Crystal analysis of grain boundaries in boron-doped diamond superconducting quantum interference devices operating above liquid helium temperature",
abstract = "Superconducting quantum interference devices (SQUIDs) are magnetometers with ultra-high sensitivity that have garnered attention owing to their potential application in flux qubits for quantum computing. The Josephson junction is an important component that determines the characteristics of a SQUID. Based on the superconductivity of heavily boron-doped diamond (111) homoepitaxial layers with a high critical temperature (Tc > 10 K), we propose two types of Josephson junction structures with discontinuous (111) boundaries. These structures allow the SQUID to operate above liquid helium temperature (4.2 K) with high reproducibility. We analyzed local misorientation and strain (i.e., compressive, tensile, and shear strain) at the boundary via electron backscatter diffraction. The Josephson junction characteristics were attributed to the weak link with discontinuous boundaries of diamond (111) sectors.",
keywords = "Grain boundary, Josephson junction, Quantum bits, Superconducting diamond, Superconducting quantum interference device",
author = "Aoi Morishita and Shotaro Amano and Ikuto Tsuyuzaki and Taisuke Kageura and Yasuhiro Takahashi and Minoru Tachiki and Shuuichi Ooi and Miwako Takano and Shunichi Arisawa and Yoshihiko Takano and Hiroshi Kawarada",
note = "Funding Information: 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) . A part of this work was conducted at NIMS Nanofabrication Platform, supported by “Nanotechnology Platform Program” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan , Grant Number JPMXP09F19NM0100 . Also, a part of this work was supported by NIMS microstructural characterization platform (NMCP) as a program of “Nanotechnology Platform” of the MEXT, Japan , Grant Number JPMXP09A19NM0127 . We thank Andrew Jackson, PhD and Suzanne Adam, PhD, from Edanz Group ( https://en-author-services.edanz.com/ac ) for editing a draft of this manuscript. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",
year = "2021",
month = aug,
day = "30",
doi = "10.1016/j.carbon.2021.04.097",
language = "English",
volume = "181",
pages = "379--388",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier Limited",
}