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Kuo, Cheng-Tai [Author]; Lin, Shih-Chieh [Author]; Rault, Julien E. [Author]; Le Fèvre, Patrick [Author]; Bertran, François [Author]; Santander-Syro, Andrés F. [Author]; Vartanyants, Ivan A. [Author]; Pickett, Warren E. [Author]; Saint-Martin, Romuald [Author]; Taleb-Ibrahimi, Amina [Author]; Fadley, Charles S. [Author]; Conti, Giuseppina [Author]; Pi, Shu-Ting [Author]; Moreschini, Luca [Author]; Bostwick, Aaron [Author]; Meyer-Ilse, Julia [Author]; Gullikson, Eric [Author]; Kortright, Jeffrey B. [Author]; Nemsak, Slavomir [Author]

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

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  • Media type: E-Article
  • Title: 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
  • Contributor: Kuo, Cheng-Tai [Author]; Lin, Shih-Chieh [Author]; Rault, Julien E. [Author]; Le Fèvre, Patrick [Author]; Bertran, François [Author]; Santander-Syro, Andrés F. [Author]; Vartanyants, Ivan A. [Author]; Pickett, Warren E. [Author]; Saint-Martin, Romuald [Author]; Taleb-Ibrahimi, Amina [Author]; Fadley, Charles S. [Author]; Conti, Giuseppina [Author]; Pi, Shu-Ting [Author]; Moreschini, Luca [Author]; Bostwick, Aaron [Author]; Meyer-Ilse, Julia [Author]; Gullikson, Eric [Author]; Kortright, Jeffrey B. [Author]; Nemsak, Slavomir [Author]
  • Published: Inst., 2018
  • Published in: Physical review / B 98(15), 155133 (2018). doi:10.1103/PhysRevB.98.155133
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevB.98.155133
  • ISSN: 1094-1622; 1550-235X; 0556-2805; 1050-2947; 1098-0121; 0163-1829; 1095-3795; 2469-9969; 1538-4489; 2469-9950
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  • Description: 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.
  • Access State: Open Access