A superlattice approach to doping infinite-layer nickelates

Abstract

The recent observation of superconductivity in infinite-layer Nd${}_{1-x}$Sr${}_x$NiO${}_2$ thin films has attracted a lot of attention, since this compound is electronically and structurally analogous to the superconducting cuprates. Due to the challenges in the phase stabilization upon chemical doping with Sr, we synthesized artificial superlattices of LaNiO${}_3$ embedded in insulating LaGaO${}_3$, and used layer-selective topotactic reactions to reduce the nickelate layers to LaNiO${}_2$. Hole doping is achieved via interfacial oxygen atoms and tuned via the layer thickness. We used electrical transport measurements, transmission electron microscopy, and x-ray spectroscopy together with ab initio calculations to track changes in the local nickel electronic configuration upon reduction and found that these changes are reversible. Our experimental and theoretical data indicate that the doped holes are trapped at the interfacial quadratic pyramidal Ni sites. Calculations for electron-doped cases predict a different behavior, with evenly distributed electrons among the layers, thus opening up interesting perspectives for interfacial doping of transition metal oxides.

12 pages, 10 figures

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Cited by in corpus (10)

• Topotactic transformation of single-crystals: from perovskite to infinite-layer nickelates
• Reconstructing the polar interface of infinite-layer nickelate thin films
• Low Valence Nickelates: Launching the Nickel Age of Superconductivity
• Soft X-ray Spectroscopy of Low-Valence Nickelates
• Synthesis and physical properties of LaNiO${}_2$ crystals
• Oxygen vacancy formation and electronic reconstruction in strained LaNiO${}_3$ and LaNiO${}_3$/LaAlO${}_3$ superlattices
• Synthesis and Properties of La${}_{1-x}$Sr${}_x$NiO${}_3$ and La${}_{1-x}$Sr${}_x$NiO${}_2$
• Distinct electridelike nature of infinite-layer nickelates and the resulting theoretical challenges to calculate their electronic structure
• Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates
• Active learning and element embedding approach in neural networks for infinite-layer versus perovskite oxides