Formulation of multi-chromism and grain size dependence in copper molybdate under complex conditions

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560851
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: University of Fukui (2014); Kyushu University (2012-2013)
• Principal Investigator: ASANO Takayuki 福井大学, 工学(系)研究科(研究院), 講師 (00301333)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: クロミズム / モリブデン酸銅

Outline of Final Research Achievements

Copper molybdate, CoMoO4, has demonstrated attractive chromism phenomena. The origin of the chromism is a structural phase transition around 200K. At the same time, the volume of this compound is reduced about 13% and the crystal is crushed. In order to gain insight into the correlation between the crushed effect and the magnetic properties of single-crystal CuMoO4, we performed magnetic susceptibility and high-field magnetization measurements. The strong antiferromagnetic interaction between Cu2+ ions drastically decreases with decreasing the size of crushed crystals. We have quantitatively revealed the correlation between the radius of grain and the changed component of the magnetic properties, and propose the existence of the component of weak antiferromagnetic interaction around the grain having the strong one.

Free Research Field

磁性物理学