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Atomic-layer-resolved composition and electronic structure of the cuprate Bi2Sr2CaCu2O8+δ from soft x-ray standing-wave photoemission
- Kuo, Cheng-Tai;
- Lin, Shih-Chieh;
- Conti, Giuseppina;
- Pi, Shu-Ting;
- Moreschini, Luca;
- Bostwick, Aaron;
- Meyer-Ilse, Julia;
- Gullikson, Eric;
- Kortright, Jeffrey B;
- Nemšák, Slavomír;
- Rault, Julien E;
- Le Fèvre, Patrick;
- Bertran, François;
- Santander-Syro, Andrés F;
- Vartanyants, Ivan A;
- Pickett, Warren E;
- Saint-Martin, Romuald;
- Taleb-Ibrahimi, Amina;
- Fadley, Charles S
- et al.
Published Web Location
https://doi.org/10.1103/physrevb.98.155133Abstract
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.
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