Scanning tunneling spectroscopy on YBa2Cu3Oy/PrBa2Cu3O y/YBa2Cu3Oy sandwiched junctions and YBa2Cu3Oy/Y0.5Pr 0.5Ba2Cu3Oy superlattices

H. C. Yang, H. W. Yu, C. C. Kuo, H. E. Horng, S. Y. Yang

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Abstract

The differential conductance, (dI/dV), on YBa2Cu3Oy/PrBa2Cu3O y/YBa2Cu3Oy (YBCO/PBCO/YBCO) sandwiched junctions and YBa2Cu3Oy/Y0.5Pr 0.5Ba2Cu3Oy (YBCO/YPBCO) superlattices was measured with STM at various temperature ranges to investigate the proximity effects. The dI/dV curves show conductance peaks at low temperatures and the energy gap, 2Δab, derived from the peaks is equal to about 46 meV for YBCO/PBCO/YBCO sandwiched junctions, which is consistent with the data obtained from reported data on YBCO single crystals whereas the YBCO/YPBCO ((120 Å/60 Å)x8) superlattices, due to the reduction of Tc, show smaller gap value.

Original languageEnglish
Pages (from-to)2443-2444
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume282
Issue numberPART 4
DOIs
Publication statusPublished - 1997 Aug

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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