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Large orbital polarization in a metallic square-planar nickelate
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Journal Article
Large orbital polarization in a metallic square-planar nickelate
2017
Overview
High-temperature cuprate superconductivity remains a defining problem in condensed-matter physics. Among myriad approaches to addressing this problem has been the study of alternative transition metal oxides with similar structures and 3
d
electron count that are suggested as proxies for cuprate physics. None of these analogues has been superconducting, and few are even metallic. Here, we report that the low-valent, quasi-two-dimensional trilayer compound Pr
4
Ni
3
O
8
avoids a charge-stripe-ordered phase previously reported for La
4
Ni
3
O
8
, leading to a metallic ground state. X-ray absorption spectroscopy shows that metallic Pr
4
Ni
3
O
8
exhibits a low-spin configuration with significant orbital polarization and pronounced
d
x
2
-
y
2
character in the unoccupied states above the Fermi energy, a hallmark of the cuprate superconductors. Density functional theory calculations corroborate this finding, and reveal that the
d
x
2
-
y
2
orbital dominates the near-
E
f
occupied states as well. Belonging to a regime of 3
d
electron count found for hole-doped cuprates, Pr
4
Ni
3
O
8
thus represents one of the closest analogues to cuprates yet reported and a singularly promising candidate for high-
T
c
superconductivity if electron doping could be achieved.
A careful study of the low-valent, quasi-two-dimensional trilayer metallic nickelate Pr
4
Ni
3
O
8
is presented, revealing this system to be a close analogue of cuprate systems, and offering tantalizing hope that it may superconduct if appropriate electron doping can be achieved.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Publishing Group (NPG)
Subject
