Experimental study on the anomalous metallic state in quasiperiodic systems

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K14663
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Suzuki Shintaro 東京理科大学, 先進工学部マテリアル創成工学科, 助教 (60837508)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 近似結晶 / 準結晶 / 新物質探索

Outline of Final Research Achievements

Inspired by the discovery of a strange metal behavior in Au-Al-Yb Tsai-type quasicrystals, Search for new compounds of quasicrystals and its approximants was performed with using elements such as Ce, which shows a localized-itinerant duality in intermetallic compounds.
As a result, new Au-Ga-Ce 1/1 Tsai-type quasicrystal approximant was discovered. Although this compound possesses a wide single-phase region and has structural degrees of freedom, the magnetic ground state was spin-glass despite chemical tuning. This result may originate from a chemical disorder, usually described as the structural degrees of freedom of the Tsai-type compounds.

Free Research Field

強相関電子系

Academic Significance and Societal Importance of the Research Achievements

準結晶関連物質の磁性研究にて基底状態の変化を引き起こすものとして認識されていた、組成変化による単原子当たりの価電子濃度の変化は、Ceを用いた場合にもその相互作用の強さを変化させうる。しかし、こうした組成自由度が存在する合金的な性質により化学的乱れが起こり、系の磁気秩序形成を阻害することが明らかとなった。そのため、従来磁性系で行われてきた探索指針とは異なる方向性で物質探索を行うことにより、異常金属状態の探索が大きく進むことが期待される。