TY  - JOUR
AU  - Kuo, Cheng-Tai
AU  - Lin, Shih-Chieh
AU  - Conti, Giuseppina
AU  - Pi, Shu-Ting
AU  - Moreschini, Luca
AU  - Bostwick, Aaron
AU  - Meyer-Ilse, Julia
AU  - Gullikson, Eric
AU  - Kortright, Jeffrey B.
AU  - Nemsak, Slavomir
AU  - Rault, Julien E.
AU  - Le Fèvre, Patrick
AU  - Bertran, François
AU  - Santander-Syro, Andrés F.
AU  - Vartanyants, Ivan A.
AU  - Pickett, Warren E.
AU  - Saint-Martin, Romuald
AU  - Taleb-Ibrahimi, Amina
AU  - Fadley, Charles S.
TI  - 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
JO  - Physical review / B
VL  - 98
IS  - 15
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2019-00543
SP  - 155133
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000447721300001
DO  - DOI:10.1103/PhysRevB.98.155133
UR  - https://juser.fz-juelich.de/record/859706
ER  -