Investigation of Ultra-High Field Properties in Itinerant Electron Systems by using High-Speed Magnetoresistance Measurement

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K20892
• 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: The University of Tokyo
• Principal Investigator: Kohama Yoshimitsu 東京大学, 物性研究所, 准教授 (90447524)
• Project Period (FY): 2020-07-30 – 2022-03-31
• Keywords: 強磁場 / 遍歴磁性 / 局在遍歴 / 電気抵抗 / 超音波 / NMR / 熱測定 / スーパーキャパシタ

Outline of Final Research Achievements

In this research, the measurement techniques available in ultra-high magnetic field have been developed to promote the effective use of recently developed 1200 T class ultra-high magnetic field. As a result, two magnetoresistance and one ultra-sound measurement techniques have been developed, enabling to investigate the electronic properties of metal and to discuss the symmetry of mater. The single turn coil method that can generate high magnetic fields of up to 300 T has been also improved.
Adding to the developments mentioned above, the experimental techniques available in non-destructive pulsed fields have been developed, where the strong pulsed field of up to 100T can be easily generated many times. The measurement of NMR and thermodynamic quntity have been achieved, as well as the successful generation of non-destructive pulsed with long duration of 1 second.
With the success of these technical developments, the platform for the high-field research has been estanblished.

Free Research Field

強磁場物理

Academic Significance and Societal Importance of the Research Achievements

これまでの物性研究は、もっぱら２０テスラ以下の弱磁場領域で行われていた。本研究は、このような探索可能な磁場領域を２０テスラから１０００テスラ程度の超強磁場領域に拡張させる挑戦的な試みといえる。この挑戦的研究は、『物質の本質を理解する』という学術的な意味を持つ。同時に、スマートフォンやハードディスクなど多種多様な電気製品に利用されている『磁性体』の深い理解を与え、更なる性能向上を将来的に導きうる。このため萌芽的ではあるが、社会的意義も深い研究と考えられる。