Magnetoelectric effect study of metallic compound with ferro toroidal state

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03447
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Shimane University
• Principal Investigator: MOTOYAMA Gaku 島根大学, 学術研究院理工学系, 准教授 (20360050)
• Co-Investigator(Kenkyū-buntansha): 山口 明 兵庫県立大学, 理学研究科, 准教授 (10302639) ; 阿曽 尚文 琉球大学, 理学部, 教授 (40313118)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 交差相関応答 / 物質開発 / 反強磁性秩序 / スピン軌道相互作用 / 交換相互作用 / 近藤効果

Outline of Final Research Achievements

We have explored magnetoelectric phenomena in symmorphic compounds of Ce3TX5(T = Ti, Zr and X = Sb, Bi), where the existence of current-induced magnetization due to some augmented multipoles is expected. We have successfully observed a current-induced magnetization in a new compound and clarified that Bi plays a major role in the magnetoelectric effect in these systems, although we were unable to observe results that could be conclusively determined to be a nonlinear transport phenomenon.
A decrease in magnetic susceptibility with decreasing temperature in the antiferromagnetic ordered state is observed on the only hard axis in Ce3TiBi5. A similar anomalous magneto-anisotropic behavior is observed under pressure in Ce3TiSb5. Since it is observed under pressure in Ce3TiSb5, which has a short Ce-Ce distance, it is thought that the cause is an anisotropic pressure effect or a strengthening of the exchange interaction between Ce and Ce due to pressure.

Free Research Field

低温物性

Academic Significance and Societal Importance of the Research Achievements

交差相関応答は対称性が低下した環境下で発現する近年注目される新しい現象であり、非対称な相互作用の解明に貢献する。一方で交差相関応答はエネルギー変換に利用可能であり、発電やセンサーとしての利用が可能である。我々の観測の成功はその環境や条件において限定的であるものの、その発現機構の解明やその定量的な評価の発達は学術的にも社会的にも寄与できる。