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个人简介
Hiroki TAKAHASHI was born in 1958 at Hokkaido, JAPAN and received his B. Sci., Master of Sci. and Ph.D of Physics in 1986 all from Hokkaido University. He became a research associate (1986) at Institute for Solid State Physics (ISSP), University of Tokyo, and then moved to Nihon University (1996). He was promoted to full Professor of Physics, Nihon University (2003). His main research field is superconductivity and magnetism under high pressure. He started to work for ISSP in 1986, when high-Tc cuprate was discovered. He developed cubic anvil press for low temperature with Prof. N. Mori to measure electrical resistivity, magnetic susceptibility, and so on, which realized excellent hydrostatic condition up to 10 GPa [1]. He performed extensive studies on high-Tc cuprates using cubic anvil press and revealed fundamental properties of cuprate superconductors [2]. During the study of cuprate superconductors, his group discovered pressure-induced metallization and superconductivity in the spin-ladder type cuprate material Sr14-xCaxCu24O41 [3], which has different Cu-O network from other cuprate superconductors. In 2006, Prof. Hosono’s group in Tokyo Institute of Technology reported a new type of superconductor LaFePO. (Tc ~ 4 K). Prof. Takahashi was very interested in that material, because it has 2D crystal structure such as cuprate superconductors. He proposed the collaboration to Prof. Hosono, and the Tc was doubled under high pressure using a diamond anvil cell. In 2008, high-pressure study for LaFeAsO1-xFx was carried out as a successive collaboration with Prof. Hosono’ group and Tc was raised to 43 K. It was the highest Tc except for cuprate superconductors, and was published in Nature [4]. He also found the maximum Tc in LaFeAsO1-xHx system is 52 K under high pressure [5]. He discovered pressure-induced spin-ladder type superconductor in iron-based material BaFe2S3 [6]. He successfully discovered the superconductivity in both the cupper-based and iron-based spin-ladder compounds under high pressure. References [1] N. Mori et al., High Pressure Research 24 (2004) 225. [2] H.Takahashi and N.Môri, Studies of High Temperature Superconductors Vol. 16, (Nova Science Publishers Inc. 1996). [3] T. Uehara et al., JPSJ65 (1996) 2764. [4] H. Takahashi et al., Nature 53 (2008) 376-378. [5] H. Takahashi et al., Sci. Rep.5(2015) 7829. [6] H. Takahashi et al., Nat. Mater.14 (2015) 1008. 邀请人:程金光
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