Systematic investigation of the unconventional anomalous Hall effect on the rare-earth compounds with geometrical frustration

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K03861
• 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: Kobe University
• Principal Investigator: Matsuoka Eiichi 神戸大学, 理学研究科, 准教授 (20400228)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 非従来型異常ホール効果 / f電子系化合物

Outline of Final Research Achievements

Although some d-electron compounds have been known to exhibit unconventional anomalous Hall effect (AHE), few f-electron compounds have been reported to exhibit AHE. In this study, physical property measurements of R6Pd13X4 (R = rare earths, X = Zn, Cd) and R6Mg23Z (Z = group 14 or 15 elements) whose R ions form geometrically-frustrated lattices have been performed to examine the similarities and differences of AHE between d- and f-electron compounds. However, it was found that these compounds do not exhibit AHE. Searching for new f-electron compounds with geometrical frustration has been performed concurrently and some new compounds such as CeMgZn2 and CeMgIn have been found to exhibit magnetic and transport properties strongly affected by frustration.

Free Research Field

磁性物理学

Academic Significance and Societal Importance of the Research Achievements

本研究で扱った化合物系においてAHEが観測されなかったことは、幾何学的フラストレーションはAHEが出現するための必要条件ではあり得ても十分条件とは言えず、その出現には反強磁性構造の対称性など、別の条件が必要であることが分かった。このことは、AHEを示す化合物の物質探索に何らかの指針を与えるはずである。さらに、本研究で見出した複数の新化合物は、f電子系におけるフラストレーションと、それに伴う物性発現という、これまで研究例が十分ではなかった観点を調べるための新しい舞台を提供したと言える。