Exotic property of europium compounds close to magnetic and valence transition.

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400348
• 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: Tohoku University
• Principal Investigator: Homma Yoshiya 東北大学, 金属材料研究所, 助教 (00260448)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ユーロピウム化合物 / メスバウアー分光 / 磁気構造 / 価数転移

Outline of Final Research Achievements

The Eu compounds with the divalent states show magnetic ordering at law temperatures. Their magnetism is dominated by the classical mean field approximation, but some of them have complex magnetic structures and multi-step　magnetic transitions as a function of temperature. Neutron diffraction is not proper to elucidate magnetic structure of the Eu compounds due to large absorption coefficient. Mossbauer spectroscopy is a powerful tool to investigate valence states and magnetic states of Eu compounds. Complicated magnetic structures of EuGa4, EuAl4 and Eu0.8La0.2Al4 were clarified by Eu-151 Mossbauer spectroscopy , Magnetization, specific heat and magnetoresistance measurements.

Free Research Field

物性物理