Preparation of Bi4(Sr, Ca)6Cu4O16+xsurfaces for photoemission studies by in situ oxygen annealing

1 February 1989

journal article
Published by IOP Publishing in Superconductor Science and Technology

Vol. 1 (5) , 221-226
https://doi.org/10.1088/0953-2048/1/5/001

Abstract

Clean surfaces of ceramic samples of the oxide superconductors Bi₄(Sr, Ca)₆Cu₄O_16+x have been prepared in a UHV system by in situ annealing under pure oxygen at atmospheric pressure. Ultraviolet photoemission spectra from the oxygen-annealed surfaces are similar to those from cleaved single crystal material, and show a small but measurable density of states at the Fermi energy. Core level photoemission spectra are presented and discussed.

Keywords

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