Suppression of Near-Fermi Level Electronic States at the Interface in aLaNiO3/SrTiO3Superlattice

A. M. Kaiser, A. X. Gray, G. Conti, J. Son, A. Greer, A. Perona, A. Rattanachata, A. Y. Saw, A. Bostwick, S. Yang, S.-H. Yang, E. M. Gullikson (+3 others)
2011 Physical Review Letters  
Standing-wave-excited photoemission is used to study a SrTiO 3 =LaNiO 3 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 LaNiO 3 . Further analysis shows that the suppression of these states is not homogeneously distributed over the LaNiO 3 layers but is more pronounced near the interfaces. Possible origins of this
more » ... igins of this effect and its relationship to a previously observed metal-insulator-transition in ultrathin LaNiO 3 films are discussed.
doi:10.1103/physrevlett.107.116402 pmid:22026689 fatcat:ze4vhuzt3fdpdozofdsineihp4