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Superconductivity in infinite-layer nickelates

REPORTS ON PROGRESS IN PHYSICS (2022)

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Summary: This study reports the synthesis of Nd6Ni5O12, a new type of superconducting nickelate material that achieves optimal cuprate-like electron filling without the need for chemical doping. The material exhibits a superconducting transition around 13K and displays behavior intermediate between cuprate-like and infinite-layer nickelate-like behavior. This indicates that square-planar nickelates are a new family of superconductors that can be tuned through both doping and dimensionality.

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Summary: Recent studies have observed superconductivity in nickelates, prompting the proposal of various candidate models to understand this phenomenon. By using magnetotransport measurements, researchers were able to probe the superconducting anisotropy in nickelates and found surprising isotropy in the upper critical field despite the layered crystal structure. This suggests that the superconductivity in nickelates is Pauli-limited, unlike traditional layered oxides.

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Summary: The recent discovery of superconductivity in Nd0.8Sr0.2NiO2 has led to questions about the underlying electronic structure hierarchy. By using locally resolved electron energy-loss spectroscopy, the Mott-Hubbard character of Nd1-xSrxNiO2 was directly probed, revealing evidence of a multiband electronic structure in the superconducting infinite-layer nickelates.

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Effect of lattice strain on the electronic structure and magnetic correlations in infinite-layer (Nd,Sr)NiO2

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Summary: In this study, the effects of electron-electron interactions and Sr doping on the electronic structure of (Nd,Sr)NiO2 were investigated using the DFT+DMFT approach. It was found that Sr doping led to a Lifshitz transition, causing a reconstruction of magnetic correlations and changes in electronic properties. The results suggest that in-plane strain plays a crucial role in adjusting the band structure of (Nd,Sr)NiO2, influencing both its electronic structure and magnetic correlations.

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Summary: In this study, the topotactic reduction of La1-xCaxNiO3 single crystals to La1-xCaxNiO2+delta using CaH2 as the reducing agent was successfully achieved. The transformation from the three-dimensional perovskite to the quasi-two-dimensional infinite-layer phase was characterized by various techniques, demonstrating that the electronic properties of the specimens resemble those of epitaxial thin films.

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Summary: The recent observation of superconductivity in thin films of infinite-layer nickelate Nd0.8Sr0.2NiO2 has attracted significant attention. Despite various efforts to understand the superconductivity in infinite-layer nickelates, a consensus on the underlying mechanism for the superconductivity has not been reached, partly due to challenges in material synthesis.

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Summary: The discovery of superconductivity in infinite-layer nickelates brings us closer to a material class similar to cuprate superconductors. Measurements of magnetic excitations in these nickelates showed that undoped NdNiO2 possesses a branch of dispersive excitations with a bandwidth of approximately 200 milli-electron volts.

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