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Tunneling Spectroscopy Study on the Origin of Coherence of Election-Pans m High-Tc Superconductor

Research Project

Project/Area Number 13440104
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionHokkaido University

Principal Investigator

IDO Masayuki  Hokkaido Univ., Grad. School of Sci., Prof., 大学院・理学研究科, 教授 (90111145)

Co-Investigator(Kenkyū-buntansha) MOMONO Naoki  Hokkaido Univ., Grad. School of Sci., Inst., 大学院・理学研究科, 助手 (00261280)
ODA Migaku  Hokkaido Univ., Grad. School of Sci., Asso. Prof., 大学院・理学研究科, 教授 (70204211)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥11,900,000 (Direct Cost: ¥11,900,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥7,800,000 (Direct Cost: ¥7,800,000)
KeywordsHigh-Tc Cuprates / Coherence of Election-Pairs / STM / STS / Condensation Energy / Pseudo Gap / Fermi Arc / 相分離 / 電子比熱 / 超伝導凝集エネルギー / トンネル分光
Research Abstract

In the present study, it was confirmed in the tunneling spectroscopy measurements on Bi2212 that the small pseudogap (SPG) starts to grow around the mean-field critical temperature of d-wave superconductors, and connects smoothly to the energy gap of the superconducting (SC) state. The development of SPG reduces the Fermi line into the so-called nodal Fermi arc centered near (π/2,π/2) at T〜T_c, as was revealed by ARPES measurements on Bi2212. In high T_c-cuprates, mobile holes on the nodal Fermi arcs have high in-plane mobility, and are expected to drive the superconductivity in the SPG regime when they start to form pairs. This is because the pairing of mobile carriers with high in-plane mobility will play a crucial role in causing the superconductivity. In fact, it was demonstrated in the present study that the remarkable reduction of U(0) in the SPG regime of La214 can be explained quantitatively on condition that only holes on the nodal Fermi arcs will be associated with the superconducutivity. This is consistent with the experimental result that the coherence peaks of both tunneling and ARPES spectra, reflecting the nature of quasi-particles over the antinodal parts of the Fermi line, are rather smeared in the SPG regime. By scanning tunneling microscopy and spectroscopy (STM/STS) measurements on Bi2212, we also ruled out the possibility that no phase separation causes the remarkable suppression of U(0), at least, in the SPG regime of interest. Thus, we concluded that mobile holes on the nodal Fermi arcs cause the superconductivity in the SPG regime.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] T.Matsuzaki: "Superconducting gap and pseudogap behavior in high-Tc cuprates"J.Phys.and Chem.Solids. 62. 29-33 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.M.Dipasupil: "Psueodgap in the tunneling spectra of slightly overdoped Bi2212"Physica C. 364-365. 604-607 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Nagata: "Pseudogap and superconductivity in La_<2-x>Sr_xCuO_4"Physica C. 364-365. 430-433 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Nagata: "Energy Gap Evolution in the Tunneling Spectra of B_<i2>Sr_2CaCu_2O_<8+δ>"J.Phys.Soc.Jpn.. 71. 1535-1540 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono: "Superconducting Condensation Energy and Psueodgap Formation in La_<2-x>Sr_xCuO_4 : New Energy Scale for Superconductivity"J.Phys.Soc.Jpn.. 71. 2832-2835 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono: "Study of Electronic Specific Heat of La_<2-x>Sr_xCuO_4 ; Pseudogap and superconductivity"NATO Science Series II. Math., Phys.and Chem.. 67. 167-176 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono: "Correlation between Superconducting Gap and Pseudogap in High-T_c Cuprates"NATO Science Series II. Math., Phys.and Chem.. 67. 177-188 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono: "Energy gap evolution over wide temperature and doping ranges in Bi_2Sr_2CaCu_2O_<8+δ>"Mod.Phys.Lett.B.. 17. 401-414 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Matsuzaki: "Superconducting condensation energy in the pseudogap region of La_<2-x>Sr_xCuO_4"Physica C. 388-389. 217-218 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Oda: "Electronic phase diagram of La_<2-x>Sr_xCuO_4"J.Phys.Chem.Solids. (in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.Gilardi: "Spin dynamics in the mixed phase of La_<2-x>Sr_xCuO_4"Physica B. (in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Matsuzaki, M.Ido, N.Momono, R.M.Dipasupil, T.Nagata, A.Sakai, M.Oda: "Superconducting gap and pseudogap behavior in high-T_c cuprares"J.Phys.Chem.Solids. Vol.62. 29-33 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.M.Dipasupil, M.Oda, T.NanJo, S.Manda, N.Momono, M.Ido: "Pseudogap in the tunneling spectra of Bi2212"Physica C. Vol.364-365. 604-607 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Nagata, N.Momono, S.Takahashi, M.Oda, M.Ido: "Pseudogap and superconductivity in La_<2-x>Sr_xCuO_4"Physica C,. Vol.364-365. 430-433 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.M.Dipasupil, M.Oda, N.Momono, M Oda: "Energy Gap Evolution in the Tunneling Spectra, of Bi_2Sr_2CaCu_2O_<8+δ>"J.Phys.Soc.Jpn.. Vol.B71. 1535-1540 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono, T.Matsuzaki, N.Momono, M.Oda, M.Ido: "Superconducting Condensation Energy and Psueodgap Formation in La<2-x>Sr_xCuO_4 : New Energy Scale for Superconductivity"J.Phys.Soc.Jpn.. Vol.B71. 2832-2835 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono, T.Nagata, T.Matsuzaki, M.Oda, M.ido: "Study of Electronic Specific Heat of La<2-x>Sr_xCuO_4, Pseudogap and superconductivity"NATO Science Series II. Math., Phys. and Chem.. Vol.67. 167-176 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Oda, N.Momono.M.ido: "Correlation between Superconducting Gap and Pseudogap in High-T_c Cuprates"NATO Science Series II. Math., Phys. and Chem.. Vol.67. 177-188 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono, M.Oda, M.Ido: "Energy gap evolution over wide temperature and doping ranges in Bi_2Sr_2CaCu_2O_<8+δ>"Mod.Phys.Lett.B. Vol.17. 401-414 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Matsuzaki, M.Ido, N.Momono, M.Oda: "Superconducting condensation energy in the pseudogap region of La<2-x>Sr_xCuO_4"Physica C. Vol.388-389. 401-414 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Oda, N.Momono, M.Ido: "Electronic phase diagram of La<2-x>Sr_xCuO_4"J.Phys.Chem.Solids. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.Gilardi, S.Streule, A.Hiess, H.M.Ronnow, M.Oda, N.Momono, Ido, J.Mesot: "Spin dynamics in the mixed phase of La<2-x>Sr_xCuO_4"Physica B. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Momono: "Energy gap evolution over wide temperature and doping ranges in Bi_2Sr_2CaCu_2O_<8+δ>"Mod.Phys.Lett.B. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Oda: "Electronic phase diagram of La_<2-x>Sr_xCuO_4"Journal of Physics and Chemistry of Solids. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Matsuzaki: "Superconducting condensation energy in the pseudogap region of La_<2-x>Sr_xCuO_4"Physica C. 384. 297 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] R.Gilardi: "Spin dynamics in the mixed phase of La_<2-x>Sr_xCuO_4 (x=0.10, x=0.17)"Physica B. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] R.M.Dipasupil: "Energy Gap Evolution in the Tunneling Spectra of Bi2Sr2CaCu2O8+δ"J. Phys. Soc. Jpn.. 71. 1535-1540 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] N.Momono: "Superconducting Condensation Energy and Psueodgap Formation in La2-xSrxCuO4 : New Energy Scale for Superconductivity"J. Phys. Soc. Jpn.. 71. 2832-2835 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Oda: "Correlation between Superconducting Gap and Pseudogap in High-Tc Cuprates"NATO Science Series II. Mathematics, Physics and Chemistry. 67. 177-188 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T. Matsuzaki: "Superocnducting gap and pseudogap behavior in high-Tc cuprates"J. Phys. and Chem. Solids. 62. 29-33 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] R. M. Dipasupil: "Psueodgap in the tunneling spectra of slightly overdoped Bi2212"Physica C. 364. 604-607 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T. Nagata: "Pseudogap and superconductivity in La2-xSrxCuO4"Physica C.

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2020-05-15  

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