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Electronic correlations and partial gap in the bilayer nickelate La3Ni2O7
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Electronic correlations and partial gap in the bilayer nickelate La3Ni2O7
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Journal Article
Electronic correlations and partial gap in the bilayer nickelate La3Ni2O7
2024
Overview
The discovery of superconductivity with a critical temperature of about 80 K in La
3
Ni
2
O
7
single crystals under pressure has received enormous attention. La
3
Ni
2
O
7
is not superconducting under ambient pressure but exhibits a transition at
T
∗
≃ 115 K. Understanding the electronic correlations and charge dynamics is an important step towards the origin of superconductivity and other instabilities. Here, our optical study shows that La
3
Ni
2
O
7
features strong electronic correlations which significantly reduce the electron’s kinetic energy and place this system in the proximity of the Mott phase. The low-frequency optical conductivity reveals two Drude components arising from multiple bands at the Fermi level. The transition at
T
∗
removes the Drude component exhibiting non-Fermi liquid behavior, whereas the one with Fermi-liquid behavior is barely affected. These observations in combination with theoretical results suggest that the Fermi surface dominated by the Ni-
d
3
z
2
−
r
2
orbital is removed due to the transition at
T
∗
. Our experimental results provide pivotal information for understanding the transition at
T
∗
and superconductivity in La
3
Ni
2
O
7
.
The bilayer nickelate La
3
Ni
2
O
7
was recently shown to be superconducting at high-pressure. Here the authors reveal strong electronic correlations and the opening of a partial gap, providing key information for understanding the nature of the density-wavelike transition at ambient pressure and superconductivity in this compound.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
