Crystal analysis of grain boundaries in boron-doped diamond superconducting quantum interference devices operating above liquid helium temperature

Aoi Morishita, Shotaro Amano, Ikuto Tsuyuzaki, Taisuke Kageura, Yasuhiro Takahashi, Minoru Tachiki, Shuuichi Ooi, Miwako Takano, Shunichi Arisawa, Yoshihiko Takano, Hiroshi Kawarada

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)379-388
ページ数10
ジャーナルCarbon
181
DOI
出版ステータスPublished - 2021 8 30

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)

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