Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
55 (1989), S. 2126-2128
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have investigated the effect of annealing polycrystalline YBa2Cu3O7−δ samples in a He ambient and in vacuum, on the composition of their internal surfaces. X-ray photoelectron spectroscopy (XPS) data indicate a decrease in the amount of BaCO3 but a higher proportion of Ba at the near-surface region upon low-temperature annealing in He or vacuum. The latter effect seems to derive from the presence of a surface barrier for oxygen outdiffusion, and can be prevented by diffusing Ag into the polycrystalline sample. Changes in the cutoff energies of the ultraviolet photoelectron spectra indicate that a submonolayer coverage of Ag is sufficient to produce a change in the work function of 0.3 eV, corresponding to the lowering of the surface barrier.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.102081
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