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Synthesis and Electronic Characterization of Nd<sub>2-x</sub>Sr<sub>x</sub>NiO<sub>4</sub> thin films (0 ≤ x ≤ 1.4)

ORAL

Abstract

Layered nickelates have been studied extensively over the last three decades due to their structural similarities to the high-Tc superconducting cuprates. Using reactive oxide molecular beam epitaxy (MBE), we synthesize Nd2-xSrxNiO4 thin films for x = 0-1.4 to probe the properties and electronic structure as a function of hole doping. The samples with lower doping show semiconducting behavior across the temperatures probed with an onset of metallic conductivity at x = 1.2. We also present polarization-dependent O-K and Ni-L2,3 x-ray absorption spectra to track the evolution of the oxygen-nickel hybridization, distribution of holes between O-2p and Ni-3d states and the nickel oxidation state across the series. Angle-resolved photoemission spectroscopy (ARPES) measurements reveal a Fermi surface that comprises a cuprate-like hole-pocket of dx2-y2 character with an additional electron pocket of d3z2-r2 character at Γ, qualitatively consistent with DFT calculations for paramagnetic La2NiO4 In contrast to measurements of the related bulk compound Eu0.9Sr1.1NiO4, we do not observe a momentum-dependent pseudogap and observe an entirely two-dimensional Fermi surface with no kz dispersion.

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Publication: Nicole K. Taylor et al. "Synthesis and Electronic Characterization of Nd$_{2-x}$Sr$_x$NiO$_4$ thin films ($0 \leq x \leq 1.4)$," Manuscript submitted to Physical Review Materials, August 2024

Presenters

  • Nicole K Taylor

    School of Engineering and Applied Science, Harvard University, Cambridge, MA, USA

Authors

  • Nicole K Taylor

    School of Engineering and Applied Science, Harvard University, Cambridge, MA, USA

  • Dan Ferenc Segedin

    Department of Physics, Harvard University, Cambridge, MA, USA

  • Ari B Turkiewicz

    Department of Physics, Harvard University, Cambridge, MA, USA

  • Yang Zhang

    The Rowland Institute at Harvard, Harvard University, Cambridge, MA, USA

  • Spencer T Doyle

    Department of Physics, Harvard University, Cambridge, MA, USA

  • Grace A Pan

    Department of Physics, Harvard University, Cambridge, MA, USA

  • Haoyue Jiang

    Lawrence Berkeley National Laboratory, Department of Physics, University of California at Berkeley, Berkeley, CA, USA

  • Aaron Bostwick

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, LBNL, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Christopher Jozwiak

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, E.O. Lawerence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Eli Rotenberg

    ALS, LBNL, Berkeley, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Alessandra Lanzara

    University of California, Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA, USA, Department of Physics, University of California, Berkeley

  • Ismail El Baggari

    Harvard University, The Rowland Institute at Harvard, The Rowland Institute at Harvard, Harvard University, Cambridge, MA, USA

  • Charles M Brooks

    Harvard University, Department of Physics, Harvard University, Cambridge, MA, USA

  • Alpha T N'Diaye

    Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Luca Moreschini

    University of California, Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA, USA, Department of Physics, University of California, Berkeley

  • Julia A Mundy

    Harvard University, Department of Physics, Harvard University, Cambridge, MA, USA