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Quantitative evaluation of pseudo gap of quasi-crystal and approximant by spectroscopy

Research Project

Project/Area Number 21K04633
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26010:Metallic material properties-related
Research InstitutionNational Institute for Materials Science

Principal Investigator

TSUDA Shunsuke  国立研究開発法人物質・材料研究機構, マテリアル基盤研究センター, 主任研究員 (80422442)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords光電子分光 / 擬ギャップ / 準結晶・近似結晶 / 電子状態 / ハイパーマテリアル
Outline of Research at the Start

規則性はあるが周期性を持たないという特殊な結晶構造を持つ準結晶は、近年様々な物性を示す物質が合成できるようになってきた。この特殊な結晶相が安定化する仕組みとして、フェルミ準位近傍に擬ギャップを開くことで相を安定させていると考えられてきているが、それを系統的・定量的に評価した例はこれまで少なかった。そこで本研究では準結晶・近似結晶の擬ギャップを、分光的手法を用いて準結晶・近似結晶の擬ギャップを系統的かつ定量的に評価し、材料設計の指針を得る。

Outline of Final Research Achievements

Quasicrystals have a peculiar crystal structure: they are regular but not periodic. It has been considered that a pseudogap near the Fermi level stabilizes this peculiar crystalline phase by opening a pseudogap. In this study, we investigated the pseudogap by means of photoelectron spectroscopy, which is a means to directly observe the pseudogap, in order to obtain guidelines for material design.
We found two types of energy-scale pseudogaps. The (pseudo)band structure must be directly observed in order to distinguish between the phonon origin and the origin of the electronic state itself.

Academic Significance and Societal Importance of the Research Achievements

準結晶・近似結晶で擬ギャップが開くことは以前から議論されてきている。しかし系統的・定量的な議論はされてこなかった。本研究はその端緒となったと考えている。特に擬ギャップを定量的に評価するための指針を整理したことで、他のマクロ物性(比熱や電気伝導)との比較が容易になったと考えている。
今後さらに多くの系で準結晶・近似結晶で擬ギャップの評価を行い、熱電特性や磁性といった有用な物性との対応がつけば、材料としての新しい分野が拓けることが期待できる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Time-of-Flight-type Photoelectron Emission Microscopy with a 10.9-eV Laser2024

    • Author(s)
      Tsuda Shunsuke、Yaji Koichiro
    • Journal Title

      e-Journal of Surface Science and Nanotechnology

      Volume: 22 Issue: 2 Pages: 170-173

    • DOI

      10.1380/ejssnt.2024-005

    • ISSN
      1348-0391
    • Year and Date
      2024-02-17
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visualization of spin-polarized electronic states by imaging-type spin-resolved photoemission microscopy2024

    • Author(s)
      Yaji Koichiro、Tsuda Shunsuke
    • Journal Title

      Science and Technology of Advanced Materials: Methods

      Volume: 4 Issue: 1 Pages: 2328206-2328206

    • DOI

      10.1080/27660400.2024.2328206

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a Photoemission Microscopy Apparatus Using a Vacuum Ultraviolet Laser2023

    • Author(s)
      Yaji Koichiro、Tsuda Shunsuke
    • Journal Title

      e-Journal of Surface Science and Nanotechnology

      Volume: 22 Issue: 1 Pages: 46-52

    • DOI

      10.1380/ejssnt.2023-066

    • ISSN
      1348-0391
    • Year and Date
      2023-10-12
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of carrier doping on the electronic states of earth-abundant Fe-Al-Si thermoelectric materials2023

    • Author(s)
      S. Tsuda, A. Yoshinari, S. Takezawa, K. Ohishi, N. Nagamura, W. Zhang, Y. Iwasaki, and Y. Takagiwa
    • Journal Title

      Materials Research Express

      Volume: 10 Issue: 5 Pages: 055506-055506

    • DOI

      10.1088/2053-1591/acd438

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] NIMSにおける顕微スピン分解光電子装置の現状I2023

    • Author(s)
      矢治光一郎、津田俊輔
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] NIMSにおける顕微スピン分解光電子装置の現状II2023

    • Author(s)
      津田俊輔、竹澤伸吾、矢治光一郎
    • Organizer
      日本物理学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Current Status of Imaging-type Photoemission Microscopy with nano-ESCA in NIMS2023

    • Author(s)
      津田俊輔、竹澤伸吾、矢治光一郎
    • Organizer
      分子研研究会 光電子分光研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Current status of imaging-type photoemission microscopy in NIMS2023

    • Author(s)
      矢治光一郎、津田俊輔
    • Organizer
      9th FOCUS workshop: Photoemission Microscopy
    • Related Report
      2023 Annual Research Report
  • [Presentation] Evaluation of electronic structure of Fe-Al-Si thermoelectric materials using photoelectron spectroscopy2023

    • Author(s)
      S. Tsuda et al
    • Organizer
      NIMS先端計測シンポジウム2023
    • Related Report
      2022 Research-status Report
  • [Presentation] Photoemission study of thermoelectric Fe-Al-Si alloy2022

    • Author(s)
      S. Tsuda et al
    • Organizer
      The 22nd International Vacuum Congress (IVC-22)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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