Towards Higher-Crystallinity Superconducting Infinite-Layer Nickelates

ORAL

Abstract

The recent discovery of superconductivity in the infinite-layer nickelates Re1–xSrxNiO2 (Re = Nd, Pr)1,2 presents an important materials challenge to further improve the crystallinity and synthetic reproducibility of this difficult material,3,4 so that intrinsic investigations of the superconducting and normal-state properties of this system can be initiated. After careful optimization of the growth and reduction conditions, we have identified key parameters for further improving crystallinity and established a reproducible method to stabilize Nd1–xSrxNiO2 (001) epitaxial thin films on SrTiO3 (001) substrate by pulsed-laser deposition and CaH2-assisted topochemical reduction. The details of the optimization process and the dependence of the structural and superconducting properties on the growth conditions will be discussed.

1 Li, D. et al., Nature 572, 624 (2019).
2 Osada, M. et al., Nano Lett. 20, 5735 (2020).
3 Wang, B.-X. et al., Phys. Rev. Mater. 4, 084409 (2020).
4 Lee, K. et al., APL Mater. 8, 041107 (2020).

*Supported by DOE BES MSD (DE-AC02-76SF00515), the Moore Foundation (GBMF4415), and DOD AFOSR (FA 9550-16-1-0305).

–

Presenters

  • Kyuho Lee

    • Department of Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University

Authors

  • Kyuho Lee

    • Department of Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University

  • Danfeng Li

    • Department of Applied Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University

  • Motoki Osada

    • Department of Applied Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University

  • Bai Yang Wang

    • Department of Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University

  • Berit H. Goodge

    • School of Applied and Engineering Physics, Cornell University
    • Applied and Engineering Physics, Cornell University

  • Lena Fitting Kourkoutis

    • School of Applied and Engineering Physics, Cornell University
    • Applied and Engineering Physics, Cornell University
    • Cornell University

  • Harold Hwang

    • Department of Applied Physics, Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab
    • Stanford Univ
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford University
    • Standford University
    • Stanford Institute for Materials and Energy Sciences, Stanford University and SLAC National Accelerator Laboratory
    • SIMES, SLAC
    • Applied Physics, Stanford University