Atomic-layer-resolved composition and electronic structure of the cuprate $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{r}}_{2}\mathrm{CaC}{\mathrm{u}}_{2}{\mathrm{O}}_{8+\delta}$ from soft x-ray standing-wave photoemission - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2018

Atomic-layer-resolved composition and electronic structure of the cuprate $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{r}}_{2}\mathrm{CaC}{\mathrm{u}}_{2}{\mathrm{O}}_{8+\delta}$ from soft x-ray standing-wave photoemission

Patrick Le Fèvre
François Bertran
Amina Taleb-Ibrahimi

Résumé

A major remaining challenge in the superconducting cuprates is the unambiguous differentiation of the composition and electronic structure of the Cu O 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-layer depth resolution of these properties. Applying SW photoemission to B i 2 S r 2 CaC u 2 O 8 + 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 3 d − 3 d 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.

Dates et versions

hal-01953182 , version 1 (12-12-2018)

Identifiants

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Cheng-Tai Kuo, Shih-Chieh Lin, Giuseppina Conti, Shu-Ting Pi, Luca Moreschini, et al.. Atomic-layer-resolved composition and electronic structure of the cuprate $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{r}}_{2}\mathrm{CaC}{\mathrm{u}}_{2}{\mathrm{O}}_{8+\delta}$ from soft x-ray standing-wave photoemission. Physical Review B, 2018, 98 (15), pp.155133. ⟨10.1103/PhysRevB.98.155133⟩. ⟨hal-01953182⟩
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