A Look at the Intrinsic Superconducting Phase Diagram of Infinite-Layer Nickelates

ORAL

Abstract

The long search for ‘cuprate-analog’ superconductivity in nickel-based oxides has been realized in the superconducting infinite-layer nickelates.1,2 Interestingly, the nickelates display notable distinctions experimentally from the cuprates, particularly in the ground state for non-superconducting doping values.3 Meanwhile, the strong correlation between superconductivity and the magnitude of normal state resistivity,3 along with nontrivial structural defects in this thermodynamically unstable material,4 hints that the established doping dependence study could be affected by extrinsic factors arising from crystalline imperfections. With new advances in sample quality, we have revisited this problem in Nd1–xSrxNiO2 (x = 0~0.3) and have found several important distinctions in the phase diagram compared to our previous investigation.3 The details of the ‘intrinsic’ phase diagram, along with the optimization process of Nd1–xSrxNiO2, will be discussed.

1.  V. I. Anisimov, D. Bukhvalov, & T. M. Rice, Phys. Rev. B 59, 7901 (1999).

2.  D. Li et al., Nature 572, 624 (2019).

3.  D. Li et al., Phys. Rev. Lett. 125, 27001 (2020).

4.  K. Lee et al., APL Mater. 8, 041107 (2020).

*This work was supported by the U. S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract No. DE-AC02-76SF00515. B.H.G. and L.F.K. acknowledge support by the Packard Foundation.

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Presenters

  • Kyuho Lee

    • Stanford University
    • Stanford University; SLAC National Accelerator Laboratory

Authors

  • Kyuho Lee

    • Stanford University
    • Stanford University; SLAC National Accelerator Laboratory

  • Motoki Osada

    • Stanford Univ
    • Stanford University; SLAC National Accelerator Laboratory
    • Stanford University

  • Bai Yang Wang

    • Stanford University
    • Stanford Univ
    • Stanford University; SLAC National Accelerator Laboratory

  • Berit H Goodge

    • Cornell University

  • Yonghun Lee

    • Stanford University

  • Woojin Kim

    • Stanford University
    • Stanford Institute for Materials and Energy Sciences

  • ChunAn Wang

    • Stanford Univ
    • Stanford University; SLAC National Accelerator Laboratory

  • Lena F Kourkoutis

    • Cornell University
    • School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, United States.

  • Harold Y Hwang

    • Stanford Univ
    • Stanford University; SLAC National Accelerator Laboratory
    • Stanford University