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.

doi:10.1103/physrevb.98.155133

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

Journal Article · 14 October 2018 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.98.155133 · OSTI ID:1563967

Kuo, Cheng-Tai ^[1]; Lin, Shih-Chieh ^[1]; Conti, Giuseppina ^[1]; Pi, Shu-Ting ^[2]; Moreschini, Luca ^[3]; Bostwick, Aaron ^[3]; Meyer-Ilse, Julia ^[3]; Gullikson, Eric ^[3]; Kortright, Jeffrey B. ^[3]; Nemšák, Slavomír ^[4]; Rault, Julien E. ^[5]; Le Fèvre, Patrick ^[5]; Bertran, François ^[5]; Santander-Syro, Andrés F. ^[6]; Vartanyants, Ivan A. ^[7]; Pickett, Warren E. ^[2]; Saint-Martin, Romuald ^[8]; Taleb-Ibrahimi, Amina ^[9]; Fadley, Charles S. ^[1]

Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Peter Grünberg Institut PGI-6, Julich (Germany)
Synchrotron SOLEIL, Gif-sur-Yvette (France)
Univ. Paris-Sud, Orsay Cedex (France)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow (Russia)
Univ. Paris-Sud, Univ. Paris-Saclay, Orsay Cedex (France)
UR1 CNRS/Synchrotron SOLEIL, Gif sur Yvette (France)

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 Bi₂Sr₂CaCu₂O_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 3d-3d Coulomb interaction, further clarifying the complex interactions in this prototypical cuprate. Here, measurements of this type for other quasi-two-dimensional materials with large c represent a promising future direction.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; FG02-04ER46111; NA0002908; SC0014697

OSTI ID:: 1563967

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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