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2018 Fiscal Year Final Research Report

Frontier Spin ARPES and SXRIXS under external perturbations of functional materials

Research Project

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Project/Area Number 16H03851
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials
Research InstitutionOsaka University

Principal Investigator

SUGA Shigemasa  大阪大学, 産業科学研究所, 名誉教授 (40107438)

Co-Investigator(Kenkyū-buntansha) 入澤 明典  大阪大学, 産業科学研究所, 助教 (90362756)
Project Period (FY) 2016-04-01 – 2019-03-31
Keywords光電子分光 / 光電子顕微鏡 / 角度分解光電子分光 / 共鳴X線非弾性散乱 / 放射光 / 軟X線 / 磁気円2色性(MCD)
Outline of Final Research Achievements

In order to fully utilize functional materials, full studies of electronic structures of both the surface and bulk are required. The former is tackled with the spin resolved 2 dimensional Momentum Microscopy and the latter can be tackled with the resonance inelastic soft X-ray scattering (SX-RIXS) under external perturbations.
We studied such materials as transition metal dichalcogenides as well as Kondo Insulator system of SmB6 with the 2D-MM and Scanning Tunneling Spectroscopy (STS) and half-metallic Ferrimagnetic Heusler alloy Mn2VAl by means of the SX-RIXS under the external magnetic field of H=0.25T. It is found that the behavior of the electronic structures of the SmB6 is in consistence with the Kondo topological insulators below 10 K, although the Kondo gap opens below 150 K from the metallic states.In the case of Mn2VAl, half-metallicity is confirmed by the present SX-RIXS MCD.

Free Research Field

スピントロニクスの基礎研究

Academic Significance and Societal Importance of the Research Achievements

角度分解光電子分光は固体電子状態のバンド構造を知る最も有力な手段と考えられている。しかもトポロジカル絶縁体のDirac Coneのスピン偏極が知られて以来膨大なスピン偏極角度分解光電子分光が実験室や放射光施設で莫大な予算を投下して行われている。本研究で開発利用しているSP-2D-MMはそれらより約百万倍以上の測定効率があり、1台でほぼ国内全体の需要を満足する。まだ開発途上の部分もあるにせよこの装置を起爆剤として我が国での研究が世界をリードできると言う意味におい更なる研究投資が必須である。また磁場下での軟X線RIXSは完全に成功し、これは磁性体バルクや超格子などの研究の主流になったと考えられる。

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Published: 2020-03-30  

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