Nickelate Superconductivity without Rare‐Earth Magnetism: (La,Sr)NiO2
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 18, 2021
- Source ID
- 10.1002/adma.202104083
Entities
People
- Bai Yang Wang
- Berit H. Goodge
- D F Li
- Harold Y. Hwang
- Kyuho Lee
- Lena F Kourkoutis
- Motoki Osada
- Shannon P Harvey
Organizations
- Air Force Office of Scientific Research
- City University of Hong Kong
- Cornell University
- Gordon and Betty Moore Foundation
- National Science Foundation
- Office of Basic Energy Sciences
- Stanford University
- United States Department of Energy