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Modifications in the electronic structure of Bi2212 single crystals induced by oxygen desorption

Lookup NU author(s): Professor Lidija Siller

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Abstract

We report a LEED, UPS and EELS study of Bi2Sr2CaCu2O8+delta single crystal. The oxygen stoichiometry of a few layers below the surface was modified by annealing in UHV at 250, 350 and 460 degrees C, and restored with subsequent annealing at 750 degrees C in an O-2 atmosphere. It has been shown that, at lower temperatures, the disordered extra-stoichiometric oxygen atoms desorb from the surface Bi-O plane, then at higher temperature an oxygen diffusion takes place from the Sr-O and Cu-O layers toward the surface Bi-O layer. An assignment of some Bi2212 EELS features, reconciling most of the published EELS data, has been performed, taking into account the dependence of the EELS spectra of Bi2212 on the primary electron beam energy and on the annealing treatments.

Publication metadata

Author(s): Goldoni A, Corradini V, Siller L, del Pennino U, Parmigiani F

Publication type: Article

Publication status: Published

Journal: Surface Science

Year: 1997

Volume: 372

Issue: 1-3

Pages: 329-336

Print publication date: 10/02/1997

Online publication date: 10/02/1997

Acceptance date: 20/08/1994

Publisher: Elsevier Science

URL: http://dx.doi.org/10.1016/S0039-6028(96)01096-5

DOI: 10.1016/S0039-6028(96)01096-5

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