2023 Fiscal Year Final Research Report
Magnetotransport properties of topological materials with nontrivial magnetic structure
| Project/Area Number |
21K03454
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Toho University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 磁性トポロジカル半金属 / 磁気抵抗効果 / ホール効果 / 単結晶育成 / 磁化プラトー |
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| Outline of Final Research Achievements |
We investigated magnetotransport properties of rare-earth intermetallic compounds with a nontrivial magnetic ordering pattern and a topological electronic band structure, and observed that topological semimetals with magnetization plateaus show the enhanced resistivity upon plateau transitions, which originates from the enhancement of electron scattering due to the development of magnetic fluctuations. In addition, we found the anomaly in the Hall conductivity in the specific magnetization plateau state, that is due to the nontrivial topology inherent to the magnetic structure.
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| Free Research Field |
物性物理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で明らかになった磁気輸送特性は，これまでに磁性トポロジカル物質で精力的に研究されてきた磁気秩序に伴う時間反転対称性の破れ及び電子バンド構造の交換分裂の効果を越える新たな機構に起因する輸送応答であり，電子バンド構造が持つ非自明なトポロジーと電子相関効果の結合により生じる強相関トポロジーの物理分野を開拓・解明に向けた研究に資する結果であると期待される．また，外場により非自明なトポロジーを有する状態を制御できる機能性は，トポロジーを動作原理に持つ将来的な素子への応用が期待される．
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