Spatially resolved transmission high energy electron loss spectrometry (EELS) has been utilized to probe the spatial variation of the hole concentration along the grain boundary (GB) plane in YBa2Cu3O7-δ (Y123). The O K pre-edge peak in the EELS spectra, which offers a quantitative measure of the hole concentration in p-type doped cuprate superconductors including Y123, has been observed to vary along the GB plane. These observations conform to the Dayem-Bridge-type model for GBs in Y123. A modified Dayem-Bridge model is presented based on the experimental observations of varying oxygen stoichiometry along the GB plane.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering