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Electrical transport in devices based on layered oxides

Research Project

Project/Area Number 18K14121
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionTohoku University

Principal Investigator

Harada Takayuki  東北大学, 金属材料研究所, 助教 (90609942)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords電子デバイス / 薄膜 / 酸化物 / デバイス / 層状物質 / 物性
Outline of Final Research Achievements

The layered oxide PdCoO2 has a crystal structure consisting of alternating Pd and CoO2 layers. The remarkable feature of PdCoO2 is its very high electrical conductivity that is comparable with that of gold. The high electrical conductivity is provided by the planar (or two-dimensional) Pd layers. This two dimensionality could give rise to exotic electrical transport properties in device structures. In this research, we studied on new electrical transport phenomena derived from the wave nature of electrons and the layered crystal structure of PdCoO2 in mesoscopic devices and heterointerfaces, to find applications in electronic devices.

Academic Significance and Societal Importance of the Research Achievements

層状酸化物PdCoO2の高い電気伝導性は電子デバイス応用に適している。本研究では、PdCoO2の物性を利用したデバイス開発を行った。PdCoO2の微細構造を低温に冷却することで、電子の干渉に由来する電気伝導特性を観測した。今後、PdCoO2薄膜の結晶品質を向上することで量子デバイスへの応用が期待される。一方で、PdCoO2は耐熱性に優れており、高温用途のデバイスにも有用である。例えば、本研究で開発したPdCoO2とGa2O3の接合からなるダイオードは、PdCoO2のイオン性層状構造に由来する界面分極により、350℃の高温でも動作できることが明らかになった。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 2018 Other

All Int'l Joint Research (3 results) Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

  • [Int'l Joint Research] Max Planck Institute FKF(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Unite Mixte de Physique CNRS/Thales(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] MPI-FKF(ドイツ)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Dynamic characteristics of PdCoO2/b-Ga2O3 Schottky junctions2020

    • Author(s)
      T. Harada, A. Tsukazaki
    • Journal Title

      Applied Physics Letters

      Volume: -

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Control of Schottky barrier height in metal/β-Ga2O3 junctions by insertion of PdCoO2 layers2020

    • Author(s)
      T. Harada, A. Tsukazaki
    • Journal Title

      APL Materials

      Volume: 8 Issue: 4 Pages: 041109-041109

    • DOI

      10.1063/1.5145117

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films2020

    • Author(s)
      Harada T.、Sugawara K.、Fujiwara K.、Kitamura M.、Ito S.、Nojima T.、Horiba K.、Kumigashira H.、Takahashi T.、Sato T.、Tsukazaki A.
    • Journal Title

      Physical Review Research

      Volume: 2 Issue: 1 Pages: 1-6

    • DOI

      10.1103/physrevresearch.2.013282

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electric dipole effect in PdCoO2/b-Ga2O3 Schottky diodes for high temperature operation2019

    • Author(s)
      T. Harada, S. Ito, A. Tsukazaki
    • Journal Title

      Science Advances

      Volume: 5 Issue: 10

    • DOI

      10.1126/sciadv.aax5733

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Highly conductive PdCoO2 ultrathin films for transparent electrodes2018

    • Author(s)
      T. Harada, K. Fujiwara, and A. Tsukazaki
    • Journal Title

      APL Materials

      Volume: 6 Issue: 4 Pages: 046107-046107

    • DOI

      10.1063/1.5027579

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] PdCoO2/β-Ga2O3エピタキシャルショットキー接合2019

    • Author(s)
      原田尚之,伊藤俊,塚﨑敦
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report 2018 Research-status Report
  • [Presentation] PdCoO2 thin film growth toward quantum electronics2019

    • Author(s)
      T. Harada
    • Organizer
      2nd International Workshop on Nanoelectronics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Thin-film growth of PdCoO2: a layered oxide as conductive as gold2019

    • Author(s)
      T. Harada and A. Tsukazaki
    • Organizer
      19th International Conference on Crystal Growth and Epitaxy (ICCGE-19)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 剥離・転写技術の新展開とデバイス作製への応用例2019

    • Author(s)
      原田尚之
    • Organizer
      電気学会フレキシブルセラミックスコーティング技術調査専門委員会研究会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] A layered oxide PdCoO2 with conductivity comparable with Au: a thin-film approach2019

    • Author(s)
      T. Harada, K. Sugawara, T. Miyakawa, T. Nakamura, H. Oinuma, T. Takahashi, T. Sato, T. Nojima, K. Fujiwara, and A. Tsukazaki
    • Organizer
      The 2nd Symposium for World Leading Research Centers - Materials Science and Spintronics -
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] デラフォサイト型層状酸化物 PdCoO2 の極薄膜化と物性2018

    • Author(s)
      原田 尚之,菅原 克明 ,宮川 智樹,中村 剛慶,追沼 暉, 高橋 隆,佐藤 宇史,藤原 宏平,塚﨑 敦
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Nonlinear Hall effect originated from the surface of PdCoO2 ultrathin films2018

    • Author(s)
      T. Harada, K. Sugawara, T. Miyakawa, T. Nakamura, H. Oinuma, T. Takahashi, T. Sato, K. Fujiwara, and A. Tsukazaki
    • Organizer
      25th International Workshop on Oxide Electronics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] An oxide as conductive as gold: PdCoO2 with graphene-like 2D Pd sheets2018

    • Author(s)
      T. Harada, K. Sugawara, T. Miyakawa, T. Nakamura, H. Oinuma, T. Takahashi, T. Sato, K. Fujiwara, and A. Tsukazaki
    • Organizer
      Summit of Materials Science 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2021-02-19  

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