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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).

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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