Suppression of disorder broadening of core-level photoelectron lines in CuAu alloys by inhomogeneous lattice distortion

T. Marten, I. A. Abrikosov, W. Olovsson, B. Johansson, R. J. Cole, G. Beamson, S. R. Haines, P. Weightman

Research output: Contribution to journalArticlepeer-review

Abstract

Disorder broadening of core-level binding energies is a general effect observed in random alloys, and identifies an opportunity for studying specific local environments experimentally. Here we study it in an archetypical system: face-centered-cubic Cu50Au50. While the disorder broadening is clearly detectable at Au, at Cu it is below the detection limit. We supplement experiments by a theoretical study where we model the alloy by a large supercell constructed as a special quasirandom structure and calculate binding-energy shifts at all sites in the supercell. Theory shows that the suppression of the disorder broadening at Cu results from a delicate balance between the influence of local chemical environment and inhomogeneous lattice distortions on the site-resolved core-level shifts. Surprisingly, even larger relaxation-induced shifts are observed at Au sites.

Original languageEnglish
Article number012201
Pages (from-to)-
Number of pages4
JournalPhysical review B: Condensed matter and materials physics
Volume79
Issue number1
DOIs
Publication statusPublished - Jan 2009

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