Invesitigation of rectification mechanisms in high-temperature superconducting films

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15217
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Nagoya University
• Principal Investigator: Tsuchiya Yuji 名古屋大学, 工学研究科, 助教 (50736080)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 超伝導 / 超伝導ダイオード / 希土類系高温超伝導薄膜 / 格子不整合 / 磁束ピンニング

Outline of Final Research Achievements

In order to elucidate the mechanism of the asymmetric critical current property (so-called superconducting diode property) in high-temperature superconducting films, this study analysed the nanostructure of the high-temperature superconducting thin films that exhibit the property, designed a superconducting diode element and demonstrated the rectification effect.
As a result, it was confirmed that the asymmetric critical current property appeared in the rare-earth-based high-Tc superconducting films deposited using a pulsed laser deposition system over a wide temperature and magnetic field range. Furthermore, nano-structural analysis revealed that the better the lattice matching between the superconducting thin film and buffer layers, the better the properties. Finally, using the thin film, a device with a permanent magnet that does not require an external magnetic field was fabricated and rectification operation using a superconducting diode was demonstrated.

Free Research Field

超伝導応用

Academic Significance and Societal Importance of the Research Achievements

本研究では、高温超伝導薄膜の臨界電流の非対称性メカニズムを解明した。この成果は、省エネルギー電力機器の問題を根本的に解決し、超低消費電力で動作する超伝導ダイオードの開発を可能にするとともに、このダイオードは量子コンピュータや次世代超伝導エレクトロニクスへの応用が期待される。本研究における超伝導ダイオード動作原理理解および素子化についての進展により、社会全体のエネルギー問題解決に向けた一歩であると同時に、情報科学への波及効果を持つ。