报告题目：Superconductivity and multiferroics in Fe-based ladder compounds

报告人：Prof. Kenya OHGUSHI（Tohoku University）

报告时间：2017年11月29日星期三下午2:30

报告地点：吉林大学中心校区物理楼333讲学厅

主办单位：吉林大学物理学院

新型电池物理与技术教育部重点实验室

报告人简介:

Kenya OHGUSHI is a professor from Graduate School of Science, Tohoku University. His research Interests includes: Condensed matter physics: magnetic, transport, and optical properties of correlated electronic systems including superconductors, quantum magnets, and quantum Hall liquids；Solid state chemistry: synthesis and characterization of new transition metal oxide, chalcogenide, and intermetallics. Homepage: http://web.tohoku.ac.jp/mqp/ohgushi-e.html

摘 要:

All the iron-based superconductors identified so far share a square lattice composed of iron atoms as a common feature. In copper-based high-Tc materials, the superconducting phase emerges not only in square-lattice structures but also in ladder structures, which give nice hints for elucidating the microscopic mechanism of the superconductivity. Here, we report the discovery of pressure-induced superconductivity in the iron-based ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below 120 K [1-4]. On the application of pressure, this compound exhibits a metal–insulator transition at about 11 GPa, followed by the appearance of superconductivity below Tc = 24 K. Moreover, I will be talking a little bit about our recent progress in searching multiferroic phase in the iron-based ladder material BaFe2Se3, which was theoretically predicted [5].

[1] F. Du, et al., Phys. Rev. B 85, 214436 (2012).

[2] F. Du, et al., Phys. Rev. B 90, 085143 (2014).

[3] H. Takahashi, et al., Nat. Mater. 14, 1008 (2015).

[4] T. Yamauchi, et al., Phys. Rev. Lett. 115, 246402 (2015).

[5] Shuai Dong, J.-M. Liu, and Elbio Dagotto, Phys. Rev. Lett. 113, 187204 (2014).