Low Valence Nickelates: Launching the Nickel Age of Superconductivity

Botana, Antia S.; Lee, Kwan-Woo; Norman, Michael R.; Pardo, Victor; Pickett, Warren E.

doi:10.48550/arxiv.2111.01296

Cited by 1 publication

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References 67 publications

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“…In the cuprates, doped holes sit preferentially on the O sites while doped electrons reside on the Cu sites [39]. In the ILN, it is thought that the carriers are also introduced directly into the 3d x 2 −y 2 orbital on the Ni sites [40]. At the same time, the similarities found in the low-T ρ ab (T) behavior of the ILN (for which no long-range AFM order exists at half-filling) and the n-doped cuprates suggests that the resistive upturns in the latter are not necessarily caused by shortrange spin correlations, as is believed to be the case for the pdoped cuprates.…”

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confidence: 99%

Correlated Insulating Behavior in Infinite-Layer Nickelates

et al. 2022

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Unlike their cuprate counterparts, the undoped nickelates are weak insulators without long-range antiferromagnetic order. Identifying the origin of this insulating behavior, found on both sides of the superconducting dome, is potentially a crucial step in the development of a coherent understanding of nickelate superconductivity. In this work, we study the normal-state resistivity of infinite-layer nickelates using high magnetic fields to suppress the superconductivity and examine the impact of disorder and doping on its overall temperature (T) dependence. In superconducting samples, the resistivity of Nd- and La-based nickelates continues to exhibit weakly insulating behavior with a magnitude and functional form similar to that found in underdoped electron-doped cuprates. We find a systematic evolution of the insulating behavior as a function of nominal hole doping across different rare-earth families, suggesting a pivotal role for strong electron interactions, and uncover a correlation between the suppression of the resistivity upturn and the robustness of the superconductivity. By contrast, we find very little correlation between the level of disorder and the magnitude and onset temperature of the resistivity upturn. Combining these experimental observations with previous Hall effect measurements on these two nickelate families, we consider various possible origins for this correlated insulator behavior and its evolution across their respective phase diagrams.

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confidence: 99%