Surface segregation of Ba in polycrystalline YBa2Cu3O7 oxides : The effect of silver

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)2126-2128
Journal / PublicationApplied Physics Letters
Volume55
Issue number20
Publication statusPublished - 13 Nov 1989
Externally publishedYes

Abstract

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.

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Citation Format(s)

Surface segregation of Ba in polycrystalline YBa2Cu3O7 oxides : The effect of silver. / Schrott, A. G.; Singco, G.; Tu, K. N.

In: Applied Physics Letters, Vol. 55, No. 20, 13.11.1989, p. 2126-2128.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review