Can photoemission accurately probe the bulk electronic structure of the complex oxides?

Jaewu Choi, C. Waldfried, S. H. Liou, P. A. Dowben

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The surface of the complex oxides, in particular the manganese perovskites, is dominated by a different free enthalpy at the surface. This can be demonstrated by surface segregation after annealing the samples. By comparing relative x-ray photoelectron spectroscopy intensities of the manganese perovskite La1-xCaxMnO3 (x = 0.1, 0.35) for different emission angles, the profile of elemental concentration was determined. Analysis shows evidence for pronounced surface segregation of calcium. Our results suggest that there are strong differences between surface and bulk enthalpies without segregation or surface relaxation. This is consistent with the previously observed surface resonance in the electronic band structure.

Original languageEnglish (US)
Pages (from-to)2950-2955
Number of pages6
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume16
Issue number5
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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