The local oxygen concentration of the high-Tc superconductor YBa2Cu3Oy, was measured from large-angle convergent-beam electron diffraction patterns using a transmission electron microscope equipped with a field emission gun with an in-column-type energy filter. The anisotropic effect of thermal vibrations of atoms was considered in the analysis of the oxygen concentration, based on the many-beam dynamic theory. The observed fluctuation in the oxygen concentration can explain the peak effect in the Jc-H curve, the critical current density Jc plotted as a function of applied magnetic field H.
ASJC Scopus subject areas
- Condensed Matter Physics