Novel physical properties of transition metal fluorides with spin frustration and competing degrees of freedom

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540345
• 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: Kyoto University
• Principal Investigator: UEDA Hiroaki 京都大学, 理学(系)研究科(研究院), 准教授 (10373276)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: スピンフラストレーション / 電荷秩序 / フッ化物 / パイロクロア

Outline of Final Research Achievements

As transition metal fluorides that have frustrated lattices, we have synthesized modified pyrochlores and double-perovskites and measured their physical properties. And then, we have discovered new phenomena originating on competing degrees of freedom. The modified pyrochlores have a charge degree of freedom, and they exhibits charge orderings and/or magnetic orderings of different spins. In the double-perovskites, we have observed various structural transitions, which are driven by the competition between Jahn-Teller instability of magnetic ions and lattice instability of perovskites owing to the space among constituent ions.

Free Research Field

磁性