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Novel transport phenomena in spin-triplet superconductor

Research Project

Project/Area Number 21740276
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionShinshu University (2010)
National Institute of Advanced Industrial Science and Technology (2009)

Principal Investigator

KAMBARA Hiroshi  Shinshu University, 教育学部, 助教 (00313198)

Project Period (FY) 2009 – 2010
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords強相関系 / スピン3重項超伝導 / ルテニウム酸化物 / カイラルp波超伝導 / Sr_2RuO_4 / トンネルスペクトル / ブレークジャンクション / スピン2重項超伝導 / Sr_2RuO_4-Ru共晶系 / 超伝導接合 / カイラルドメイン
Research Abstract

Using micro fabrication techniques, we investigated local transport characteristics of spin-triplet p-wave superconductor Sr_2RuO_4 (SRO). We observed novel phenomena such as, (i) an unconventional hysteresis in voltage-current characteristics in a few μm-width weak junction, and (ii) a large enhancement of superconducting critical current density with reducing cross section below 100m^2. These phenomena imply that edge states are formed in a microfabricated SRO device. We also studied tunnel spectra of an SRO break junction formed by microfabrication. The tunnel spectra showed broad zero-bias conductance peaks, which supports the chiral p-wave state in SRO.

Report

(3 results)
  • 2010 Annual Research Report   Final Research Report ( PDF )
  • 2009 Annual Research Report
  • Research Products

    (16 results)

All 2010 2009

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (10 results)

  • [Journal Article] DC Current Driven Critical Current Variation in Sr2RuO4-Ru Junction Proved by Local Transport Measurements2010

    • Author(s)
      H.Kambara, T.Matsumoto, H.Kashiwaya, S.Kashiwaya, H.Yaguchi, Y.Asano, Y.Tanaka, Y.Maeno
    • Journal Title

      J.Phys.Soc.Jpn 79

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Unconventional transport characteristics of p-wave superconducting junctions in Sr_2RuO_4-Ru eutectic system2010

    • Author(s)
      H.Kambara, S.Kashiwaya, H.Yaguchi, Y.Asano, Y.Tanaka, Y.Maeno
    • Journal Title

      Physica C 470 S685-S687

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] DC Current Driven Critical Current Variation in Sr_2RuO_4-Ru Junction Proved by Local Transport Measurements2010

    • Author(s)
      H.Kambara, et al.
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 79

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Unconventional transport characteristics of p-wave superconducting junctions in Sr_2RuO_4-Ru eutectic system2010

    • Author(s)
      H.Kambara, et al.
    • Journal Title

      Physica C

      Volume: 470

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Chiral Superconducting Phase Transition in 3-K Phase of Sr_2RuO_42009

    • Author(s)
      H.Kambara, S.Kashiwaya, H.Yaguchi, Y.Asano, Y.Tanaka, Y.Maeno
    • Journal Title

      Physica C 469 1030-1033

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Chiral superconducting phase transition in 3-K phase of Sr_2RuO_42009

    • Author(s)
      H.Kambara, et al.
    • Journal Title

      Physica C 469

      Pages: 1030-1033

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] Local Transport Characteristics in Sr_2RuO_4 Microbridges2010

    • Author(s)
      H. Kambara, S. Kashiwaya, H. Kashiwaya, Y. Tanaka, Y. Maeno
    • Organizer
      23rd International Symposium on Superconductivity (ISS2010)
    • Place of Presentation
      Epochal Tsukuba, Tsukuba, Japan
    • Year and Date
      2010-11-03
    • Related Report
      2010 Final Research Report
  • [Presentation] Local Transport Characteristics in Sr_2RuO_4 Microbridges2010

    • Author(s)
      H.Kambara, et al.
    • Organizer
      23rd International Symposium on Superconductivity
    • Place of Presentation
      エポカルつくば
    • Year and Date
      2010-11-03
    • Related Report
      2010 Annual Research Report
  • [Presentation] Sr_2RuO_4における面間局所輸送特性2010

    • Author(s)
      神原浩, 柏谷聡, 田仲由喜夫, 前野悦輝
    • Organizer
      日本物理学会2010年秋季大会
    • Place of Presentation
      大阪府立大学
    • Year and Date
      2010-09-25
    • Related Report
      2010 Annual Research Report 2010 Final Research Report
  • [Presentation] Sr_2RuO_4-Ru共晶系における局所伝導特性2010

    • Author(s)
      神原浩, 柏谷聡, 矢口宏, 浅野泰寛, 田仲由喜夫, 前野悦輝
    • Organizer
      日本物理学会第65回年次大会
    • Place of Presentation
      岡山大学
    • Year and Date
      2010-03-20
    • Related Report
      2010 Final Research Report 2009 Annual Research Report
  • [Presentation] Anomalous Voltage-Current Characteristics in Microfabricated Sr_2RuO_4-Ru Eutectic Junction2009

    • Author(s)
      H. Kambara, S. Kashiwaya, H. Kashiwaya, Y. Tanaka, Y. Maeno
    • Organizer
      22nd International Symposium on Superconductivity (ISS2009)
    • Place of Presentation
      Epochal Tsukuba, Tsukuba, Japan
    • Year and Date
      2009-11-04
    • Related Report
      2010 Final Research Report
  • [Presentation] Sr_2RuO_4-Ru共晶系における磁場中局所伝導測定2009

    • Author(s)
      神原浩, 柏谷聡, 矢口宏,浅野泰寛, 田仲由喜夫, 前野悦輝
    • Organizer
      日本物理学会2009年秋季大会
    • Place of Presentation
      熊本大学
    • Year and Date
      2009-09-25
    • Related Report
      2010 Final Research Report 2009 Annual Research Report
  • [Presentation] Anomalous Critical Current Variation in Microfabricated Sr_2RuO_4-Ru Eutectic Junction2009

    • Author(s)
      H. Kambara, S. Kashiwaya, H. Yaguchi, Y.Asano, Y. Tanaka, Y. Maeno
    • Organizer
      International Workshop "Novel Spin Pairing 2009 (NSP2009)
    • Place of Presentation
      Yukawa Memorial Hall, Kyoto University, Japan
    • Year and Date
      2009-09-14
    • Related Report
      2010 Final Research Report
  • [Presentation] Unconventional Transport Characteristics of p-wave Superconducting Junctions in Sr_2RuO_4-Ru eutectic system2009

    • Author(s)
      H.Kambara, S.Kashiwaya, H.Yaguchi, Y.Asano, Y.Tanaka, Y.Maeno
    • Organizer
      The 9th International Conference on Materials and Mechanisms of Superconductivity (M2S-IX)
    • Place of Presentation
      Keio Plaza Hotel, Tokyo
    • Year and Date
      2009-09-08
    • Related Report
      2010 Final Research Report
  • [Presentation] Unconventional transport characteristics of p-wave superconducting junctions in Sr_2RuO_4-Ru eutectic system2009

    • Author(s)
      H.Kambara
    • Organizer
      The 9th International Conference on Materials and Mechanisms of Superconductivity (M^2S-IX)
    • Place of Presentation
      京王プラザホテル
    • Year and Date
      2009-09-08
    • Related Report
      2009 Annual Research Report
  • [Presentation] Anomalous Transport Characteristics of p-wave Superconducting Channel in the 3-K Phase of Sr_2RuO_42009

    • Author(s)
      H.Kambara, S.Kashiwaya, H.Yaguchi, Y.Asano, Y.Tanaka, Y.Maeno
    • Organizer
      New Directions of Superconducting Nanostructures 2009 (NDSN 2009)
    • Place of Presentation
      Nagoya University, Nagoya
    • Year and Date
      2009-09-04
    • Related Report
      2010 Final Research Report

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Published: 2009-04-01   Modified: 2020-05-15  

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