Advances in Superconductivity IV pp 79-82 | Cite as
Changes of Electronic States of Superconducting Oxides by Various Surface Treatments Studied by XPS and SEM
Abstract
Changes of electronic states and surface morphology by scraping and fracturing have been investigated for the Nd-Ce-Cu-O and Ba-K-Bi-O superconductors using x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) in order to check the suitability of the surface treatments for photoemission studies. Scraping the samples with a file considerably changes the electronic states at the surfaces: the spectral intensity at the Fermi level is decreased and the line shape of core levels varied. On the other hand, the clear Fermi edge is observed for the fractured surfaces. These results are discussed in terms of oxygen defects and structural changes in the surface region.
Key Words
photoemission surface treatment Nd-Ce-Cu-O superconductor Ba-K-Bi-O superconductorPreview
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