Superconductivity in the parent infinite-layer nickelate NdNiO${}_2$

Abstract

We report evidence for superconductivity with onset temperatures up to 11 K in thin films of the infinite-layer nickelate parent compound NdNiO${}_2$. A combination of oxide molecular-beam epitaxy and atomic hydrogen reduction yields samples with high crystallinity and low residual resistivities, a substantial fraction of which exhibit superconducting transitions. We survey a large series of samples with a variety of techniques, including electrical transport, scanning transmission electron microscopy, x-ray absorption spectroscopy, and resonant inelastic x-ray scattering, to investigate the possible origins of superconductivity. We propose that superconductivity could be intrinsic to the undoped infinite-layer nickelates but suppressed by disorder due to its nodal order parameter, a finding which would necessitate a reconsideration of the nickelate phase diagram. Another possible hypothesis is that the parent materials can be hole doped from randomly dispersed apical oxygen atoms, which would suggest an alternative pathway for achieving superconductivity.

Main: 10 pages, 6 figures. Supplementary: 9 pages, 10 figures

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Cited by in corpus (6)

• Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO${}_2$
• Distinct orbital contributions to electronic and magnetic structures in La${}_4$Ni${}_3$O${}_{10}$
• Spin-glass state in nickelate superconductors
• Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices
• Superconducting phase diagram of multi-layer square-planar nickelates
• Orbital-selective spin-triplet superconductivity in infinite-layer LaNiO${}_2$