APS Logo

Orbital and spin character of doped carriers in infinite-layer nickelates

ORAL

Abstract

The recent discovery of superconductivity in Sr-doped infinite-layer NdNiO2 [1] has sparked significant interest in condensed matter physics. The search of superconductivity in nickel oxides was inspired by mimicking some of the essential characteristics of cuprates, such as the layered crystal structure and nominal 3d9 valence configuration [2]. Yet, some distinctions emerge including large charge-transfer energy and presence of small electron pockets from rare-earth 5d orbitals [3,4]. At this early stage, a key open question is the evolution of the electronic structure with doping. The competition between electron correlation, charge-transfer energy, crystal field splitting and Hund’s exchange may give rise to different scenarios, where doped holes could be introduced into Ni (in a high- or low-spin state), O or Nd bands. Here, we use a combination of x-ray absorption spectroscopy (XAS), resonant inelastic x-ray scattering (RIXS) and multiplet calculations to determine the dominant configuration of doped holes in Nd1-xSrxNiO2.

References
[1] D. Li et al. Nature 572, 624 (2019)
[2] V. I. Anisimov et al. Phys. Rev. B 59, 7901 (1999)
[3] K. W. Lee and W. E. Pickett, Phys. Rev. B 70, 165109 (2004)
[4] M. Hepting et al. Nat. Mater. 19, 381 (2020)

–

Presenters

  • Matteo Rossi

    Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford University

Authors

  • Matteo Rossi

    Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford University

  • Haiyu Lu

    Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, Stanford Univ

  • Abhishek Nag

    Diamond Light Source, Diamond Light Source, UK

  • 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

  • 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

  • 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

  • Stefano Agrestini

    Diamond Synchrotron Light Source, Diamond Light Source, Diamond Light Source, UK, ALBA Synchrotron Light Source

  • Mirian Garcia-Fernnandez

    Diamond Light Source, Diamond Light Source, UK, Diamond Light Source, Harwell Science & Innovation Campus

  • Yi-De Chuang

    Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, LBNL

  • Zhixun Shen

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

  • 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

  • Brian John Moritz

    SLAC, Stanford University, Stanford Univ, Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SIMES, SLAC

  • Ke-jin Zhou

    Diamond Light Source, Diamond Light Source, UK, Diamond Light Source, Harwell Science & Innovation Campus

  • Thomas Devereaux

    Stanford Univ, SLAC, Stanford, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, SIMES, SLAC, SLAC

  • Wei-Sheng Lee

    Stanford Institute for Materials and Energy Sciences, SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SIMES, SLAC