Direct evidence for negative grain boundary potential in ca-doped and undoped YBa2Cu3O7-x

Marvin A. Schofield, Marco Beleggia, Yimei Zhu, Karsten Guth, Christian Jooss

Research output: Contribution to journalJournal articleResearchpeer-review


The reduction of negative charge at grain boundary (GB) dislocations in Ca doped YBa2Cu3O7 (YBCO) was compared to undoped YBCO. Compared to large-angle GB, the small GBs were shown to offer unique opportunities that reveal electrostatic properties of separated interfacial dislocation of cores. It was found that due to the finite width of the valence band in the superconducting CuO2 planes, the negative GB charge leads to a depletion of electron holes available for superconductivity. A significant reduction in the size of the perturbed region in the Ca-doped samples was found to be the principle mechanism for the improved interfacial superconductivity.
Original languageEnglish
Article number195502
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 2004
Externally publishedYes


  • Calcium
  • Electron holography
  • Electronic properties
  • Electronic structure
  • Grain boundaries
  • Ground state
  • Magnetooptical devices
  • Semiconductor doping
  • Spectroscopic analysis
  • Superconductivity
  • Transmission electron microscopy
  • Yttrium barium copper oxides
  • T


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