Field Effects on the Dielectric Property of YBCO Bicrystal Grain Boundary Junctions

K. Nakajima, K. Yokota, H. Myoren, J. Chen, T. Yamashita

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Electric field effects on YBCO grain boundary Josephson junctions combined with inverted MIS (Metal, Insulator, Superconductor) structures were studied. Current steps and hysteresis recognized in current-voltage curves were strongly affected by the field. The current steps were attributed to the self-excited resonances, i.e., Fiske steps. Both the effects were interpreted by the field dependence of the effective dielectric constant of the grain boundary which has a certain contribution from the large dielectric constant of SrTiO3, substrates. The effective dielectric constant normalized with barrier thickness of the junction was estimated to be about 40 nm-1 for the zero gate voltage and was decreased by a factor of 2 with the electric field of ±16kV/cm. This feature is assumed adequate for tuning the phase velocity in the bicrystal grain boundaries.

Original languageEnglish
Pages (from-to)2861-2864
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - 1995 Jun

ASJC Scopus subject areas

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


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