Surface vs. bulk Coulomb correlations in photoemission spectra of perovskites

Details Surface vs. bulk Coulomb correlations in photoemission spectra of perovskites Surface vs. bulk Coulomb correlations in photoemission spectra of perovskites

2002-11-13

arxiv.org/abs/cond-mat/0211257v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 3 figures

Scientific paper

10.1103/PhysRevLett.90.096401

Recent photoemission spectra of the perovskite series Sr$_x$Ca$_{1-x}$VO$_3$ revealed strong modifications associated with surface contributions. To study the effect of Coulomb correlations in the bulk and at the surface the quasi-particle spectra are evaluated using the dynamical mean field theory. It is shown that as a result of the reduced coordination number of surface atoms correlation effects are stronger at the surface than in the bulk, in agreement with experiment.

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