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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)379-388
Number of pages10
JournalCarbon
Volume181
DOIs
Publication statusPublished - 2021 Aug 30

Keywords

  • Grain boundary
  • Josephson junction
  • Quantum bits
  • Superconducting diamond
  • Superconducting quantum interference device

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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