Development and investigation of kagome metal materials with unconventional magnetotransport properties

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K13996
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: The University of Tokyo
• Principal Investigator: Ishikawa Hajime 東京大学, 物性研究所, 助教 (70843192)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: カゴメ格子金属 / ハニカム格子金属 / 磁性 / 超伝導 / パルス強磁場

Outline of Final Research Achievements

Metallic materials with two-dimensional kagome or honeycomb lattices are expected to exhibit linear dispersion or flat region in the electronic band structure and show electronic properties that are significantly different from those of ordinary metals, however, such examples are limited.
In this study, we have investigated the physical properties of a 3d transition metal kagome system YxFe6Sn6 and revealed that it is a material where the spin, lattice, and the conduction electrons of iron are strongly coupled.
We also discovered a new superconductor La2IOs2, which has a honeycomb lattice of the 5d transition metal osmium. We have proposed it is a new material that exhibits a competition between the electronic phase transition and superconductivity

Free Research Field

物性物理学

Academic Significance and Societal Importance of the Research Achievements

二次元のカゴメ格子やハニカム格子を持つ金属では、格子の対称性に起因して一般的な金属とは大きく異なる性質を示すと考えられています。本研究では、遷移金属のカゴメ格子やハニカム格子をもつ新しい物質を合成して性質を明らかにし、磁性と電気伝導性の強い結びつきや、超伝導といった特異な電子物性を観測しました。以上の成果は、物性物理分野の中心的な課題の一つである、電子自由度の秩序と電気伝導性の相関に関する研究に新たな舞台を提示しました。