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Updated: Aug 24, 2026
Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
Published on: May 10, 2021
Direct evidence for negative grain boundary potential in Ca-doped and undoped YBa2Cu3O7-x
Marvin A Schofield1, Marco Beleggia, Yimei Zhu
1Brookhaven National Laboratory, Upton, New York 11973, USA. schofield@bnl.gov
Abstract:
Using electron holography in a transmission electron microscope, we obtained direct evidence for the reduction of negative charge at grain boundary dislocations in Ca-doped YBa2Cu3O7 (YBCO) when compared to undoped YBCO. Because of the finite width of the valence band in the superconducting CuO2 planes, the negative grain boundary charge can lead to a depletion of electron holes available for superconductivity. A significant reduction in the size of the perturbed region in the Ca-doped samples appears to be the principal mechanism for the improved interfacial superconductivity.
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