Transport Characterization of Infinite Layer Nickelate Superconductors*

The recently discovered infinite layer nickelate superconductor presents a potential new family of unconventional superconductors [1]. A wide range of perspectives [2,3], emphasizing single- or multi-orbital electronic structure, Kondo or Hund’s coupling, and analogies to cuprates, have been proposed. Clearly, further experimental characterization of the superconducting state is needed to develop a foundational understanding of the nickelates. Furthermore, a detailed characterization of the difference between the nickelates and cuprates may provide new insights into the ingredients of superconductivity in layered oxide systems. As a step in this direction, we investigate and report the magnetotransport properties of nickelates in both the normal and superconducting state, with a focus on the anisotropic upper critical field.

[1] Li, D. et al. Superconductivity in an infinite-layer nickelate. Nature 572, 624–627 (2019).
[2] Lee, K.-W. & Pickett, W. E. Infinite-layer LaNiO₂: Ni¹⁺ is not Cu²⁺. Phys. Rev. B 70, 165109 (2004).
[3] Jiang, M., Berciu, M. & Sawatzky, G. A. Critical nature of the Ni spin state in doped NdNiO₂. Phys. Rev. Lett. 124, 207004 (2020).