3 years ago

# Atomic-layer-resolved composition and electronic structure of the cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ from soft x-ray standing-wave photoemission.

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

A major remaining challenge in the superconducting cuprates is the unambiguous differentiation of the composition and electronic structure of the CuO$_2$ 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-atomic layer depth resolution of these properties. Applying SW photoemission to Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (Bi2212) 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 supermodulation structure--as determined by comparison to DFT calculations, by Ca-Sr intermixing, and by 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.

Publisher URL: http://arxiv.org/abs/1801.05142

DOI: arXiv:1801.05142v1

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