Study of magnetic frustration in the lithium-substituted rare-earth compounds

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540359
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Saitama University
• Principal Investigator: KOSAKA Masashi 埼玉大学, 理工学研究科, 准教授 (20302507)
• Co-Investigator(Renkei-kenkyūsha): MICHIMURA Shinji 埼玉大学, 科学分析支援センター, 助教 (40552310) ; OHOYAMA Kenji 東北大学, 金属材料研究所, 准教授 (60241569) ; NAKANISHI Yoshiki 岩手大学, 大学院工学研究科, 准教授 (70322964) ; HIGEMOTO Wataru 独立行政法人日本原子力開発機構, 先端基礎研究センター, 研究主幹 (90291103) ; KITO Hijiri 独立行政法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (30356886)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 強相関電子系 / 磁性 / フラストレーション / 低温物性 / 希土類金属間化合物

Outline of Final Research Achievements

We found that the intermetallic compound Yb5Ge4 indicates the development of short-range correlations caused by magnetic frustration. Yb5Ge4 is the mother material of Yb4LiGe4, which is designed to reinforce the magnetic frustration effects performed by the Li-substitution. The diffraction anomalous fine structure method (DAFS), X-ray structural technique, reveals one of three crystallographic sites of Yb ions occupies the Yb3+ state and the other sites are in the Yb2+ state. The valence-ordered state already realizes at room temperatures, therefore, the low-dimensional magnetic network has been formed by Yb3+ ions. The anomalous behaviors in the temperature dependences of magnetization and specific heat of Yb5Ge4 are due to the development of short-range magnetic correlations, which arises from low-dimensionality effects of magnetic interactions.

Free Research Field

物性実験