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Valence fluctuations and volumetric functions in samarium monosulfide SmS

Research Project

Project/Area Number 20H00346
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 29:Applied condensed matter physics and related fields
Research InstitutionNagoya University

Principal Investigator

Takenaka Koshi  名古屋大学, 工学研究科, 教授 (60283454)

Co-Investigator(Kenkyū-buntansha) 松野 丈夫  大阪大学, 大学院理学研究科, 教授 (00443028)
片山 尚幸  名古屋大学, 工学研究科, 准教授 (50623758)
鈴木 博之  東京大学, 物性研究所, 高度学術専門職員 (60354370)
今中 康貴  国立研究開発法人物質・材料研究機構, 技術開発・共用部門, 副プラットフォーム長 (70354371)
横山 泰範  函館工業高等専門学校, 一般系, 准教授 (80402486)
岡本 佳比古  東京大学, 物性研究所, 教授 (90435636)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2022: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Fiscal Year 2021: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2020: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Keywords価数揺動 / 金属絶縁体転移 / 電場誘起転移 / 硫化サマリウム / 電子構造 / 体積変化 / 価数転移 / 光反射率 / 体積機能 / アクチュエータ
Outline of Research at the Start

一硫化サマリウムSmSの価数揺動に起因する4f電子数と体積の相関を、徹底的な組成の制御とFermi準位付近の電子構造やSmの価数状態の評価により解明し、革新的なアクチュエータ材料を創製する。SmSは(4f)6と(4f)5(5d)1、2つの電子配置が拮抗しており、後者は格子体積が9%小さい。前者は絶縁体で7F0の非磁性状態、後者は金属的で6H5/2の磁性状態であるため、電場や磁場により絶縁体-金属転移を誘起できれば、体積を制御できる。これを活用し、ピエゾ材料や磁歪材料のような従来の「歪駆動アクチュエータ」材料の欠点を克服しうる、新しい「体積変化駆動アクチュエータ」材料を創製する。

Outline of Final Research Achievements

Using series of single crystals of Sm1-xRxS (R=Ca, Y, Ce, Pr, Nd), we investigated the correlation between valence fluctuation and volume of SmS, and obtained the following results: (1) The electric field-induced insulator-metal transition at liquid nitrogen temperature is not accompanied by a volume change. (2) In Sm1-xCaxS, even if it becomes metallic due to dielectric breakdown caused by an electric field, the reflectivity in the infrared-ultraviolet region does not show a large-scale spectrum change that characterizes valence transition caused by pressure or element substitution. The present results suggest that the electric field-induced metallic phase is different from the metallic phase that appears due to valence transition.

Academic Significance and Societal Importance of the Research Achievements

SmSの価数転移は、希土類化合物が示す顕著な性質として、基礎物理学のみならず、工学の分野でも関心が高い。とりわけ電場による絶縁体-金属転移の誘起や負の微分抵抗の出現と価数転移の関係が注目を集めている。本研究の成果は、電場によって生じる特異な金属状態、伝導状態を理解する上で重要な実験結果を提示するものである。とりわけ、圧力誘起や元素置換による価数転移とは異なる機構であることを示したことは、この物質群の電子状態の理解に大きな貢献をすると考えられる。

Report

(5 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report
  • Research Products

    (11 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (8 results) (of which Peer Reviewed: 8 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Int'l Joint Research] 台湾国立放射光研究センター(その他の国・地域)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Giant Negative Thermal Expansion Materials: Progress of Research and Future Prospects2024

    • Author(s)
      K. Takenaka
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 65 Issue: 3 Pages: 243-252

    • DOI

      10.2320/matertrans.MT-Y2023008

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2024-03-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fabrication of metal matrix composites with negative thermal expansion zinc pyrophosphate filler2024

    • Author(s)
      R. Kasugai, K. Takano, D. Hirai, and K. Takenaka
    • Journal Title

      Applied Physics Letters

      Volume: 124 Issue: 2

    • DOI

      10.1063/5.0188133

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electroactive actuator composites utilizing volume change induced by insulator-to-metal transition in VO22023

    • Author(s)
      K. Takenaka, Y. Mizuno, J. Shibutani, K. Kishida, K. Takada, K. Yagi, Y. Yokoyama, N. Katayama, Y. Okamoto, D. Hirai, T. Hatano, and A. Fujita
    • Journal Title

      Applied Physics Letters

      Volume: 123 Issue: 23

    • DOI

      10.1063/5.0175670

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structural phase transition and negative thermal expansion in Cu1.8Zn0.2V2-xPxO7 solid solutions2022

    • Author(s)
      K. Takenaka, M. Kano. R. Kasugai, K. Takada, K. Eto, Y. Kadowaki, Y. Yokoyama, N. Katayama, and Y. Okamoto
    • Journal Title

      Applied Physic Express

      Volume: 15 Issue: 2 Pages: 025504-025504

    • DOI

      10.35848/1882-0786/ac4926

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Giant negative thermal expansion of polycrystalline Ti2O3 induced by microstructural effects2021

    • Author(s)
      Kadowaki Y.、Kasugai R.、Yokoyama Y.、Katayama N.、Okamoto Y.、Takenaka K.
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 17 Pages: 171901-171901

    • DOI

      10.1063/5.0068637

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structural phase transition and giant negative thermal expansion in pyrophosphate Zn1-xMgxP2O72021

    • Author(s)
      Kadowaki Y.、Kasugai R.、Yokoyama Y.、Katayama N.、Okamoto Y.、Takenaka K.
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 20 Pages: 201906-201906

    • DOI

      10.1063/5.0073761

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Giant Magneto-Volume and Magneto-Caloric Effects of Frustrated Antiferromagnet Mn3GaN under Hydrostatic Pressure2021

    • Author(s)
      K. Takenaka, T. Sugiura, Y. Kadowaki, M. Ozeki, Y. Okamoto, and A. Fujita
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 4 Pages: 044601-044601

    • DOI

      10.7566/jpsj.90.044601

    • NAID

      40022539013

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Annealing effects on negative thermal expansion properties of ball-milled β-Cu1.8Zn0.2V2O7 fine particles2020

    • Author(s)
      V. Warne-Lang, M. Sato, M. Ozeki, Y. Kadowaki, Y. Yokoyama, N. Katayama, Y. Okamoto, and K. Takenaka
    • Journal Title

      Ceramics International

      Volume: 46 Issue: 17 Pages: 27655-27659

    • DOI

      10.1016/j.ceramint.2020.07.261

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] Negative thermal expansion and related volumetric functionality of pyro-vanadate-phosphates,2023

    • Author(s)
      K. Takenaka
    • Organizer
      4th International Symposium on Negative Thermal Expansion and Related Materials (ISNTE-4)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Cu2V2O7の構造相転移と元素置換の効果2021

    • Author(s)
      高田航平, 渋谷隼矢, 加納雅, 片山尚幸, 岡本佳比古, 竹中康司
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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