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Material Design for High-T_c Superconductors by MBE and Study for Electronic State Using Cross Sectional STM

Research Project

Project/Area Number 07454176
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

BANDO Yoshichika  Institute for Chemical Research, Kyoto University Professor, 化学研究所, 教授 (70027027)

Co-Investigator(Kenkyū-buntansha) TERASHIMA Takahito  Institute for Chemical Research, Kyoto University Instructor, 化学研究所, 助手 (40252506)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsHigh-T_c Superconductor / Material Design / MBE / Cross Sectional STM / Charge Reservior Block / YBa_2Cu_3O_<7-delta> / SrCuO_2 / PrBa_2Cu_3O_<7-delta> / Sr(La)TiO_3
Research Abstract

It is widely accepted that high-T_c superconducting oxides have the inherent superstructures comprising of conducting blocks based on CuO_2 layrs and charge reservoir blocks. This subject concerns the growth of heterostructures of high-T_c oxides on atomic scales by molecular beam epitaxy (MBE) for the material design. We have studied PrBa_2Cu_3O_<7-delta> (PrBCO) /YBa_2Cu_3O_<7-delta> (YBCO) /PrBCO and SrTiO_3/SrCuO_2 heterostructures.
We have found that the surface one unit cell layr of c-axis oriented YBCO shows a superconductivity when the terminating CuO_<1-delta> layr has covered with an oxide, which has MO rocksalt-type layr, to form MO-CuO-BaO charge reservoir block. This result is of primary importance for the tunneling junctions and electric field devices.
We have succeeded the change of electrical resistivity for SrCuO_2 thin films with infinite layr structure by applying electric field.
It has been found through scanning tunneling microscope (STM) observation that YBCO and SrRuO_3 grow by a two-dimensional unit cell by unit cell growth manner and a step flow growth manner, respectively. Cross sectional TEM observation for designed heterostructures would reveal the electronic structures and carrier doping mechanism into conducting layrs.
We have successfully grown heterostructures consisting of ultrathin layrs of high-T_c superconducting oxides. Recently, milli-meter wave generator using Josephson plasma oscillations have attracted much attentions for a promising applications of high-T_c superconductors. Our result would contribute to realize the fabrication of such devices.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] T. Terashima: "Field Effecnts in YBa_2Cu_3O_<7-δ> Ultrathin Films" Proceedings of the Seventh US-Japan Workshop on High-T_c Superconductors, Oct. 24-25, 1995, Tsukuba, Japan (eds. K. Tachikawa, et al.). 184-187 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y. Bando: "Effect of Adjacent Insulating Oxide Layers on Superconductivity of One Unit Cell Thick YBa_2Cu_3O_<7-δ> Layers in PrBa_2Cu_3O_<7-δ>/YBa_2Cu_3O_<7-δ>/Insulating Oxide Trilayers" J. Cryst. Growth. 150. 1074-1079 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 寺嶋孝仁: "原子層制御された高温超伝導体超格子の設計と合成" まてりあ. 19A. 1328-1331 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Terashima: "Field Effecnts in YBa_2Cu_3O_<7-delta> Ultrathin Films" Proceedings of the Seventh US-Japan Workshop on High-T_c Superconductors, Oct.24-25,1995, Tsukuba, Japan (eds.K.Tachikawa, et al.). 184-187 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Terashima: "Field Effecnts in YBa_2Cu_3O_<7-δ> Ultrathin Films" Proceedings of the Seventh US-Japan Workshop on High-T,Superconductors,Oct.24-25,1995,Tsukuba,Japan(eds.K.Tachikawa,et al.). 184-187 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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