Understand iron-based superconductivity through materials with a separate spatial dimensionality

2015 Fiscal Year Final Research Report

• Project/Area Number: 26800175
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: NAMBU Yusuke 東北大学, 金属材料研究所, 准教授 (60579803)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 鉄系超伝導 / 次元性 / 中性子散乱

Outline of Final Research Achievements

Iron-based superconductivity has attracted a lot of interest due to a possibly novel pairing mechanism. To elucidate the mechanism of the iron-based superconductivity, we performed research on systems with a separate spatial dimensionality. Magnetic structures of AFe2X3 (A = K, Rb, Cs, Ba; X = S, Se, Te) have been determined through representation analysis to neutron powder diffraction data. We successfully induced first superconducting state in BaFe2S3 by applying hydrostatic pressures. In addition, we succeeded in observing characteristic to low-dimensional systems such as magnetic fluctuations over a wide temperature regime and magnetic excitations, and finding that the dilution in (Ba,Cs)Fe2Se3 can completely suppress the magnetic ordering.

Free Research Field

物性物理学