%0 Journal Article
%A Kuo, Cheng-Tai
%A Lin, Shih-Chieh
%A Conti, Giuseppina
%A Pi, Shu-Ting
%A Moreschini, Luca
%A Bostwick, Aaron
%A Meyer-Ilse, Julia
%A Gullikson, Eric
%A Kortright, Jeffrey B.
%A Nemsak, Slavomir
%A Rault, Julien E.
%A Le Fèvre, Patrick
%A Bertran, François
%A Santander-Syro, Andrés F.
%A Vartanyants, Ivan A.
%A Pickett, Warren E.
%A Saint-Martin, Romuald
%A Taleb-Ibrahimi, Amina
%A Fadley, Charles S.
%T Atomic-layer-resolved composition and electronic structure of the cuprate B i 2 S r 2 CaC u 2 O 8 + δ from soft x-ray standing-wave photoemission
%J Physical review / B
%V 98
%N 15
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2019-00543
%P 155133
%D 2018
%X A major remaining challenge in the superconducting cuprates is the unambiguous differentiation of the composition and electronic structure of the CuO2 layers and those of the intermediate layers. The large c axis for these materials permits employing soft x-ray (930.3 eV) standing wave (SW) excitation in photoemission that yields atomic layer-by-layer depth resolution of these properties. Applying SW photoemission to Bi2Sr2CaCu2O8+δ yields the depth distribution of atomic composition and the layer-resolved densities of states. We detect significant Ca presence in the SrO layers and oxygen bonding to three different cations. The layer-resolved valence electronic structure is found to be strongly influenced by the atomic supermodulation structure, as determined by comparison to density functional theory calculations, by Ca-Sr intermixing, and by correlation effects associated with the Cu 3d−3d Coulomb interaction, further clarifying the complex interactions in this prototypical cuprate. Measurements of this type for other quasi-two-dimensional materials with large c represent a promising future direction.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000447721300001
%R 10.1103/PhysRevB.98.155133
%U https://juser.fz-juelich.de/record/859706