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Emergence of Room Temperature Supercondutor under Ambient Pressure

Research Project

Project/Area Number 22K18692
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionThe University of Electro-Communications (2024)
Okayama University (2022-2023)

Principal Investigator

Akimitsu Jun  電気通信大学, 大学院情報理工学研究科, 客員教授 (80013522)

Co-Investigator(Kenkyū-buntansha) 堀金 和正  岡山大学, 自然生命科学研究支援センター, サイテック・コーディネーター(特任) (10406829)
Project Period (FY) 2022-06-30 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords室温超伝導 / ボロン系 / 遷移金属酸化物 / 高温超伝導 / ボロン化合物
Outline of Research at the Start

「室温超伝導の実現」は、人類の夢の一つである。確かに、「物理学の夢」の10本の指の中に挙げられていることは間違いない。最近、申請者は「室温伝導体(Tc~350K)」と思われる物質Ti-B-Cを発見した。しかし、その超伝導体積分率は1%以下であり、その成分を取り出し、それを単相化し、結晶構造を決定する必要がある。それが本申請の目的である。
本物質が実現出来れば、現在のエネルギー問題の解決に向けての第一歩になることは間違いない。

Outline of Final Research Achievements

Aiming to achieve room temperature superconductivity, we focus on the boride compound and transition metal oxides. In order to clarify the weak anomaly in the susceptibility around 350 K observed in TiB2, we synthesized samples assuming the presence of metastable phases in the Ti-B binary system, new boron carbides, and contamination during the synthesis process. As a result, we succeeded in synthesizing the main phases of metastable phases TiB and Ti3B4, and TiBC with Ti layer inserted between BC layers, but could not reproduce the anomaly around 350K.
Furthermore, we attempted to synthesize electron-doped Sr2IrO4 phase by Li-ion intercalation, where high-Tc superconductivity is expected to appear. However, no sign of superconductivity was observed.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた主な成果は、純良なTiBCの合成法の確立とLi-B-C三元素系試料での新規超伝導シグナルの観測である。これらは、高温超伝導発現が予想されているBC3層を有する層状ホウ炭化物における新超伝導体開発への重要な示唆を与える。また、同様に214型遷移金属酸化物では、Sr2IrO4はSrサイトへの他元素置換を組み合わせることで、少量ではあるがLiインターカレーションされた可能性があり、理論計算から超伝導発現に重要とされるエレクトロンドープへつながる成果といえる。
以上のように、これらの成果は、新しい高温超伝導体開発へつながる重要な学術的意義がある。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (21 results)

All 2025 2024 2023 2022

All Journal Article (16 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 14 results,  Open Access: 2 results) Presentation (4 results) (of which Invited: 2 results) Book (1 results)

  • [Journal Article] Sensitivity of electronic structure to crystal distortions in infinite-layered LaNiO22025

    • Author(s)
      Rathnayaka S.、Yano S.、Moree J.-B.、Kawashima K.、Akimitsu J.、Brown C. M.、Neuefeind J.、Louca D.
    • Journal Title

      Physical Review B

      Volume: 111 Issue: 1 Pages: 014518-014518

    • DOI

      10.1103/physrevb.111.014518

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Element-selective observation of the orbital angular momentum of Fe and Co in the noncentrosymmetric magnets Fe1-xCoxSi (x=0.25 and 0.50)2025

    • Author(s)
      Mito M.、Ohkuma M.、Tajiri T.、Kousaka Y.、Akimitsu J.、Inoue K.、Amemiya K.
    • Journal Title

      Physical Review B

      Volume: 111 Issue: 2 Pages: 024412-024412

    • DOI

      10.1103/physrevb.111.024412

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetostriction related to skyrmion-lattice formation in chiral magnet FeGe2024

    • Author(s)
      Mito Masaki、Tajiri Takayuki、Kousaka Yusuke、Miyagawa Marina、Koyama Tamami、Akimitsu Jun、Inoue Katsuya
    • Journal Title

      Journal of Applied Physics

      Volume: 136 Issue: 12 Pages: 123902-123902

    • DOI

      10.1063/5.0227382

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 超伝導の夢2023

    • Author(s)
      秋光 純
    • Journal Title

      現代化学

      Volume: 633 Pages: 45-47

    • Related Report
      2023 Research-status Report
  • [Journal Article] Origin of unexpected Ir3+ in superconducting candidate Sr2IrO4 analyzed by photoelectron holography2023

    • Author(s)
      R. Horie, T. Matsushita, S. Kawamura, T. Hase K. Horigane, H. Momono, S. Takeuchi, H. Tomita, Y. Hashimoto, K. Kobayashi, Y. Haruyama, H. Daimon, Y. Morikawa, M. Taguchi, J. Akimitsu
    • Journal Title

      Inorganic Chemistry

      Volume: 62 Issue: 28 Pages: 10897-10904

    • DOI

      10.1021/acs.inorgchem.2c03788

    • Related Report
      2023 Research-status Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Structural Characterization of Graphite Analogue BCx Synthesized Under Various Conditions and Its Application to Ti Intercalation2023

    • Author(s)
      Kazumasa Horigane, Masayuki Tadokoro, Ritsuko Eguchi, Hirofumi Ishii, Shinichi Nakamura, Takashi Kambe, Naoshi Ikeda, Hidenori Goto, Yoshihiro Kubozono, Jun Akimitsu
    • Journal Title

      Inorganic Chemistry

      Volume: 62 Issue: 48 Pages: 19466-19473

    • DOI

      10.1021/acs.inorgchem.3c02405

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Soliton locking phenomenon in bulk single crystal of monoaxial chiral magnet MnNb3S62023

    • Author(s)
      Ohkuma M.、Mito M.、Kousaka Y.、Ohe J.、Akimitsu J.、Kishine J.、Inoue K.
    • Journal Title

      Applied Physics Letters

      Volume: 122 Issue: 9

    • DOI

      10.1063/5.0137379

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic-ground-state-dependent magnetostriction effects on chiral magnet CrNb3S62023

    • Author(s)
      Masaki Mito, Takayuki Tajiri, Yusuke Kousaka, Jun Akimitsu, J. Kishine, and Katsuya Inoue
    • Journal Title

      Phys. Rev, B

      Volume: 107

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multiple-site Ag doping in Bi2Se3: Compositional crossover from substitution to intercalation as revealed by photoelectron diffraction and X-ray fluorescence holography2022

    • Author(s)
      F. Matsui, H. Ota, R. Eguchi, H. Goto, K. Kobayashi, J. Akimitsu, H. Ozaki, T. Nishioka, K. Kimura, K. Hayashi, T. Shimano, N. Happo, and Y. Kubozono
    • Journal Title

      J. Electron Spectrosc. Relat. Phenom.

      Volume: 264 Pages: 147295-147295

    • DOI

      10.1016/j.elspec.2023.147295

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nonequilibrium Chiral Soliton Lattice in the Monoaxial Chiral Magnet MnNb3S62022

    • Author(s)
      M. Ohkuma, M. Mito, H. Deguchi, Y. Kousaka, J. Ohe, J. Akimitsu, J. Kishine, and K. Inoue
    • Journal Title

      Phys Rev, B

      Volume: 106

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] An emergence of chiral helimagnetism or ferromagnetism governed by Cr intercalation in a dichalcogenide CrNb3S62022

    • Author(s)
      Kousaka Y.、Ogura T.、Jiang J.、Mizutani K.、Iwasaki S.、Akimitsu J.、Togawa Y.
    • Journal Title

      APL Materials

      Volume: 10 Issue: 9

    • DOI

      10.1063/5.0101351

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Observing the orbital angular momentum of Fe and Co in chiral magnet Fe0.75Co0.25Si using soft x-ray magnetic circular dichroism2022

    • Author(s)
      Mito M.、Ohkuma M.、Tajiri T.、Kousaka Y.、Akimitsu J.、Inoue K.、Amamiya K.
    • Journal Title

      Journal of Applied Physics

      Volume: 131 Issue: 15

    • DOI

      10.1063/5.0086493

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] New magnetic intermediate state, “B-phase”, in the cubic chiral magnet MnSi2022

    • Author(s)
      M. Ohkuma, M. Mito, M. Pardo-Sainz, Y. Kousaka, S. Iwasaki, K. Ohishi, J. Akimitsu, K. Inoue, V. Laliena, and J. Campo
    • Journal Title

      APL Materials

      Volume: 10 Issue: 4 Pages: 041104-041104

    • DOI

      10.1063/5.0084342

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Chirality-controlled enantiopure crystal growth of a transition metal monosilicide by a floating zone method2022

    • Author(s)
      Kousaka Yusuke、Iwasaki Satoshi、Sayo Taisei、Tanida Hiroshi、Matsumura Takeshi、Araki Shingo、Akimitsu Jun、Togawa Yoshihiko
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 4 Pages: 045501-045501

    • DOI

      10.35848/1347-4065/ac4e2f

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Paramagnetic Magnetostriction in the Chiral Magnet CrNb3S6 at Room Temperature2022

    • Author(s)
      M. Mito, T. Tajiri, Y. Kousaka, Y. Togawa, J. Akimitsu, J. Kishine, and K. Inoue
    • Journal Title

      Phys Rev, B

      Volume: 105

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] 磁気的Berezinskii-Kosterlitz-Thouless転移視察の試み2022

    • Author(s)
      戸川欣彦、岸根順一郎、秋光純
    • Journal Title

      固体物理

      Volume: 57 Pages: 25-42

    • Related Report
      2022 Research-status Report
  • [Presentation] 2次元XY型強磁性体K2CuF4における中性子小角散乱実験2024

    • Author(s)
      小関真, 大石一城, 高阪勇輔, 戸川欣彦, 秋光純, 益田隆嗣
    • Organizer
      日本物理学会第79回年次大会
    • Related Report
      2024 Annual Research Report
  • [Presentation] 層状ホウ炭化物BCx (x~3)の結晶性向上とインタカレーションの試み2024

    • Author(s)
      塩見透慎, 堀金和正, 秋光純, 神戸高志
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2024 Annual Research Report 2023 Research-status Report
  • [Presentation] 超伝導と人生―より高いTcを持つ超伝導を目指して―2023

    • Author(s)
      秋光 純
    • Organizer
      愛媛大学先進超高圧科学研究拠点(PRIUS)シンポジウム特別講演
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] ボルテックス転移”再訪-実験と理論の新展開-2023

    • Author(s)
      秋光 純
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Book] Superconductors with hyperordered structures in 'Hyperordered Structures in Materials' edited by Koichi Hayashi, Chapter 182023

    • Author(s)
      Y.Kubozono, J.Akimitsu
    • Publisher
      Springer Nature
    • Related Report
      2022 Research-status Report

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Published: 2022-07-05   Modified: 2026-01-16  

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