2021 Fiscal Year Final Research Report

Development of angle-resolved tunneling spectroscopy down to the micro Kelvin range

Research Project

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Project/Area Number	19K21845
Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Allocation Type	Multi-year Fund
Review Section	Medium-sized Section 13:Condensed matter physics and related fields
Research Institution	Kanazawa University
Principal Investigator	Yoshida Yasuo 金沢大学, 数物科学系, 准教授 (10589790)
Co-Investigator(Kenkyū-buntansha)	岡田佳憲沖縄科学技術大学院大学, 量子物質科学ユニット, 准教授 (00707656) 松本宏一金沢大学, 数物科学系, 教授 (10219496) 辻井宏之金沢大学, 学校教育系, 教授 (10392036) 阿部聡金沢大学, 数物科学系, 教授 (60251914) 島村一利金沢大学, 総合技術部(理工), 技術職員 (80869991)
Project Period (FY)	2019-06-28 – 2022-03-31
Keywords	角度分解測定 / 超伝導 / 磁性
Outline of Final Research Achievements	In order to investigate the gap symmetry of superconductors with low superconducting transition temperatures, we have developed a magnetic field angle-resolved measurement system that can operate at very low temperatures (down to the micro K region). A piezoelectric rotator was used as the rotation mechanism to rotate the sample in a magnetic field, and test measurements were performed from room temperature to 2 K and from zero to 14 T in magnetic fields. Measurements at room temperature were performed using a cobalt thin film that exhibits the in-plane Hall effect, and smooth 360-degree magnetic field angle-resolved transport measurements could be performed with high accuracy in a short time of less than 20 minutes. The angular dependence of the critical magnetic field of NbSe2 at 4 K was also in good agreement with previous studies.
Free Research Field	低温物理学
Academic Significance and Societal Importance of the Research Achievements	本研究で開発した装置は、測定の精度を向上させ、低温まで温度範囲を広げることで、非従来型超伝導体の超伝導ギャップの対称性や鉄系超伝導体などで観察されている量子液晶状態を効率的に調べることができるようになると考えられる。また、角度分解能が従来の回転機構に比べて高いため、より詳細な角度依存の情報を得ることが期待される。更に、様々な測定に応用できるよう汎用的に設計されており、今回テストを行った輸送特性やトンネル分光の測定だけでなく、熱測定や磁気歪みなどの測定にも応用することができる。