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Superconductivity in a quintuple-layer square-planar nickelate
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Journal Article
Superconductivity in a quintuple-layer square-planar nickelate
2022
Overview
Since the discovery of high-temperature superconductivity in copper oxide materials
1
, there have been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials
2
. One prime materials platform has been the rare-earth nickelates and, indeed, superconductivity was recently discovered in the doped compound Nd
0.8
Sr
0.2
NiO
2
(ref.
3
). Undoped NdNiO
2
belongs to a series of layered square-planar nickelates with chemical formula Nd
n
+1
Ni
n
O
2
n
+2
and is known as the ‘infinite-layer’ (
n
=
∞
) nickelate. Here we report the synthesis of the quintuple-layer (
n
= 5) member of this series, Nd
6
Ni
5
O
12
, in which optimal cuprate-like electron filling (
d
8.8
) is achieved without chemical doping. We observe a superconducting transition beginning at ~13 K. Electronic structure calculations, in tandem with magnetoresistive and spectroscopic measurements, suggest that Nd
6
Ni
5
O
12
interpolates between cuprate-like and infinite-layer nickelate-like behaviour. In engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors that can be tuned via both doping and dimensionality.
The authors report a superconducting transition beginning at 13 K in films of the quintuple-layer nickelate Nd
6
Ni
5
O
12
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Nature - Nature Publishing Group
