Abstract
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 YBa 2Cu 3O 7−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.
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