Transport and noise properties of high Tc bicrystal junctions

K. Enpuku, T. Minotani, F. Shiraishi, S. Ohta

Research output: Contribution to journalConference articlepeer-review


Transport properties of YBa2Cu3O7-x bicrystal junctions are studied from the relationship between the critical current Ic and the resistance R of the junction. The relation is obtained when misorientation angle of the junction is changed from 24 to 36.8 degrees. The experimental result can be well explained when two effects are taken into account in the tunnelling of electrons, i.e. resonant tunnelling of quasiparticles via localized states in an insulating barrier and d-wave symmetry of the superconducting order parameter. Low frequency 1/f noise of the junction is also measured, and the fluctuations of Ic and R are obtained as a function of junction parameters. A simple model of the barrier height fluctuation due to the capture and emission of electrons in the localized states can quantitatively explain the experimental results. The present model can consistently explain both the transport and noise characteristics of the bicrystal junction.

Original languageEnglish
Pages (from-to)792-794
Number of pages3
JournalSuperconductor Science and Technology
Issue number11
Publication statusPublished - Nov 1999
EventProceedings of the 1999 International Superconductive Electronics Conference - Berkeley, CA, USA
Duration: Jun 21 1999Jun 25 1999

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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