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Search for High T_c Superconductors Capable Selective Doping

Research Project

Project/Area Number03555001
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionThe University of Tokyo

Principal Investigator

UCHIDA Shin-ichi  The University of Tokyo, Department of Applied Physics, Professor, 工学部, 教授 (10114399)

Project Period (FY) 1991 – 1992
Project Status Completed(Fiscal Year 1992)
Budget Amount *help
¥6,200,000 (Direct Cost : ¥6,200,000)
Fiscal Year 1992 : ¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1991 : ¥4,200,000 (Direct Cost : ¥4,200,000)
KeywordsOxide Superconductors / Copper Oxides / Bismuth Oxides / P-Type Doping / N-Type Doping / Superconducting PN Junction / PrBa_2Cu_3O_7 / PrBa_2Cu_3O_7 / 高温超伝導酸化物 / P型ド-ピング / N型ド-ピング / Y系超伝導体 / Pr置換体
Research Abstract

The purpose of the project is to search for high T_c marerials suitable for the electronic device application. Two approaches have been adopted. One is a search for materials with less anisotropy and longer coherence length which would relrese the difficulty in utilizing the high-T_c materials for conventional superconducting devices such as Josephson and three-terminal devices. It has been demonstrated that a perovskite oxide, Ba_<1-x>K_xBiO_3 with T_c=30K, is most promising and there is a possibility to fabricate all-oxide-SIS junctions using this material.
The second is to search for potential materials which might lead to the development of a novel high T_c electronic device using properties unique to high T_c's. PrBa_2Cu_3O_7 - Pr-substituted compound of YBa_2Cu_3O_7(Y123) - is found to be a most interesting candidate. The present study has revealed that the CuO_2 planes in Pr123 are not doped with holes, which is the reason for non-metallic property, due to relatively small Madelung energy difference between in-plane O and Cu site as well as to the valence fluctuation of Pr. The magnitude of the Madelung energy difference is comparable with that in Pr_2CuO_4, a parent material of N-type high T_c superconductors. This fact strongly suggests that Pr123 might be doped with electrons. Attempts for N-type doping have been made by substituting Ce for Pr, La for Ba or F for O, though N-type doping has not been successful yet. If Pr123 were made an N-type superconductor, it would open a door to the development of a novel high T_c device with superconducting PN junctions in a Pr123/Y123 superlattice. Pr123/Y123 superlattice.

Report

(3results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report

Research Products

(28results)

All Other

All Publications

  • [Publications] 玉作 賢治: "Charge dynamics across the CuO_2 planes in La_<2-x>Sr_xCuO_4" Phys.Rev.Lett.69. 1455-1458 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 竹中 康司: "Anisotropic optical spectrum of untwinned PrBa_2Cu_3O_7" Phys.Rev.B. 46. 5833-5836 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 泰信: "Anisotropic transport properties of single crystal La_<2-x-y>Nd_ySr_xCuO_4" Phys.Rev.B. 46. 5841-5844 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 吉田 政司: "Two magnon and two-phonon excitations in some parent insulating compounds of the high T_c cuprates" Phys.Rev.B. 46. 6505-6510 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 内田 慎一: "Electron correlation and charge dynamics in high T_c copper oxides" J.Phys.Chem.Solids. 53. 1603-1610 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 内田 慎一: "Electronic structure and fermiology of high T_c superconductors Experimental summary" J.Phys.Chem.Solids. 53. 1717-1720 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 内田 慎一: "Electronic Properties and Mechanisms of High T_c Super conductors-Optical study of the high T_c cuprates" Elsevier Science Publishers, 433 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Tamasaku: "Charge dynamics across the CuO_2 planes in La_<2-x>Sr_xCuO_4" Phys. Rev. Lett.69. 1455-1458 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takenaka: "Anisotropic optical spectrum of untwinned PrBa_2Cu_3O_7" Phys. Rev.B46. 5833-5836 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y. Nakamura: "Anisotropic transport properties of single crystal La_<2-x-y>Nd_ySr_xCuO_4" Phys. Rev.B46. 5841-5844 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M. Yoshida: "Two magnon and two-phonon excitations in some parent insulating compounds of the high T_c cuprates" Phus. Rev.B46. 6505-6510 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S. Uchida: "Electron correlation and charge dynamics in the high T_c copper oxides" J. Phys. Chem.Solids 53. 1603-1610 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S. Uchida: "Electronic structure and fermiology of high T_c superconductors: Experimental summary" J. Phys. Chem.Solids 53. 1717-1720 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S. Uchida: Elseiver Science Publishers. Electronic Properties and Mechanism of high T_c Superconductors - Optical study of the high T_c cuprates, 433 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 玉作 賢治: "Charge dynamics across the CuO_2 planes in La_<2-x>Sr_xCuO_4" Phys.Rev.Lett.69. 1455-1458 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 竹中 康司: "Anisotropic optical spectrum of untwinned PrBa_2Cu_3O_7" Phys.Rev.B. 46. 5833-5836 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 泰信: "Anisotropic transport properties of single crystal La_<2-x-y>Nd_ySr_xCuO_4" Phys.Rev.B. 46. 5841-5844 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 吉田 政司: "Two magnon and two-phonon excitations in some parent insulating compounds of the high T_c cuprates" Phys.Rev.B. 46. 6505-6510 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 内田 慎一: "Electron correlation and charge dynamics in high T_c copper oxides" J.Phys.Chem.Solids. 53. 1603-1610 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 内田 慎一: "Electronic structure and fermiology of high T_c superconductors Experimental summary" J.Phys.Chem.Solids. 53. 1717-1720 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 内田 慎一: "Electronic Properties and Mechanisms of High T_c Super conductors Optical study of the high T_c cuprates" Elsevier Science Publishers, 433 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 内田 慎一: "Electronic Structure of copper oxide superconductors" Physica C (Amsterdam). 185-189. 28-33 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 安藤 淳: "Low-energy electron loss spectroscopy on Bi_2Sr_2Ca_<n‐1>Cu_nO_<2n+5>" Jpn.J.Appl.Phys.30. 1371-1374 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 有馬 孝尚: "Optical excitations in CuO_2 sheets and their strong dependence on Cu-O coordination and bond length" Phys.Rev.B. 44. 917-920 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 内田 慎一: "Optical Spectra of La_<2‐x>Sr_xCuO_4" Phys.Rev.B. 43. 10496-10507 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Alexander: "Electronic Structure studies on the N-type doped superconductors by electron-energy-loss spectroscopy" Phys.Rev.B. 43. 333-343 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹中 康司: "Optical studies on twin-free YBa_2Cu_3O_7 and PrBa_2Cu_3O_7" Phys.Rev.B.

    • Related Report
      1991 Annual Research Report
  • [Publications] 内田 慎一: "Encyclopedia of Physical Science and Technology (Academic Press)" Robert A.Meyers, 617 (1991)

    • Related Report
      1991 Annual Research Report

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Published : 1991-04-01   Modified : 2016-04-21  

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