Nickelate Superconductivity without Rare-Earth Magnetism : (La,Sr)NiO2

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Motoki Osada
  • Bai Yang Wang
  • Berit H. Goodge
  • Shannon P. Harvey
  • Kyuho Lee
  • Lena F. Kourkoutis
  • Harold Y. Hwang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2104083
Journal / PublicationAdvanced Materials
Volume33
Issue number45
Online published18 Sep 2021
Publication statusPublished - 11 Nov 2021

Abstract

The occurrence of unconventional superconductivity in cuprates has long motivated the search for manifestations in other layered transition metal oxides. Recently, superconductivity is found in infinite-layer nickelate (Nd,Sr)NiO2 and (Pr,Sr)NiO2 thin films, formed by topotactic reduction from the perovskite precursor phase. A topic of much current interest is whether rare-earth moments are essential for superconductivity in this system. In this study, it is found that with significant materials optimization, substantial portions of the La1−xSrxNiO2 phase diagram can enter the regime of coherent low-temperature transport (x = 0.14 - 0.20), with subsequent superconducting transitions and a maximum onset of ≈9 K at x = 0.20. Additionally, the unexpected indication of a superconducting ground state in undoped LaNiO2 is observed, which likely reflects the self-doped nature of the electronic structure. Combining the results of (La/Pr/Nd)1−xSrxNiO2 reveals a generalized superconducting dome, characterized by systematic shifts in the unit cell volume and in the relative electron-hole populations across the lanthanides.

Research Area(s)

  • nickelates, rare-earth, superconductivity, thin films

Citation Format(s)

Nickelate Superconductivity without Rare-Earth Magnetism : (La,Sr)NiO2. / Osada, Motoki; Wang, Bai Yang; Goodge, Berit H.; Harvey, Shannon P.; Lee, Kyuho; Li, Danfeng; Kourkoutis, Lena F.; Hwang, Harold Y.

In: Advanced Materials, Vol. 33, No. 45, 2104083, 11.11.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review