Correlated Insulating Behavior in Infinite-Layer Nickelates

Y. T. Hsu*, M. Osada, B. Y. Wang, M. Berben, C. Duffy, Nigel E Hussey, AL Et

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
58 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number846639
Number of pages8
JournalFrontiers in Physics
Volume10
DOIs
Publication statusPublished - 24 Mar 2022

Bibliographical note

Funding Information:
We acknowledge the support of the HFML-RU/NWO, a member of the European Magnetic Field Laboratory (EMFL).

Funding Information:
This work was supported by the Netherlands Organisation for Scientific Research (NWO) grant No. 16METL01 “Strange Metals” and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 835279-Catch-22). The work at SLAC/Stanford is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract number DE-AC02-76SF00515; and the Gordon and Betty Moore Foundations Emergent Phenomena in Quantum Systems Initiative through grant number GBMF9072 (synthesis equipment).

Publisher Copyright:
Copyright © 2022 Hsu, Osada, Wang, Berben, Duffy, Harvey, Lee, Li, Wiedmann, Hwang and Hussey.

Keywords

  • superconductivity
  • nickelates
  • charge transport
  • metal-insulator crossover
  • high magnetic fields

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