Journal Article

PreJuSER-17267

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Suppression of Near-Fermi Level Electronic States at the Interface in a LaNiO3/SrTiO3 Superlattice

Kaiser, A. M.FZJ* ; Gray, X. ; Conti, G. ; Son, J. ; Greer, A. ; Perona, A. ; Rattanachata, A. ; Saw, A. J. ; Bostwick, A. ; Yang, S. ; Yang, S.-H. ; Gullikson, E. M. ; Kortright, J. ; Stemmer, B. S. ; Fadley, C. S.

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7340  doi:10.1103/PhysRevLett.107.116402

Abstract: Standing-wave-excited photoemission is used to study a SrTiO3/LaNiO3 superlattice. Rocking curves of core-level and valence band spectra are used to derive layer-resolved spectral functions, revealing a suppression of electronic states near the Fermi level in the multilayer as compared to bulk LaNiO3. Further analysis shows that the suppression of these states is not homogeneously distributed over the LaNiO3 layers but is more pronounced near the interfaces. Possible origins of this effect and its relationship to a previously observed metal-insulator-transition in ultrathin LaNiO3 films are discussed.

Keyword(s): J

Note: We are grateful to Leon Balents for helpful discussion and comments. This work was supported by a MURI program of the Army Research Office (Grant No. W911-NF-09-1-0398). The Advanced Light Source and J. B. K. are supported by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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