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Unconventional density-wave state in Ruddlesden‒Popper nickelate La₄Ni₃O₁₀.

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¹Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China.

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|May 14, 2026

Summary

Researchers investigated density-wave (DW) transitions in La4Ni3O10 using nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR). They discovered a two-stage DW order, crucial for understanding high-temperature superconductivity in Ruddlesden-Popper nickelates.

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Effect of Microwave Synthesis Conditions on the Structure of Nickel Hydroxide Nanosheets

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Published on: August 18, 2023

Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity Research

Background:

Superconductivity in Ruddlesden-Popper (RP) nickelates presents a new avenue for studying high-temperature superconductivity.
Previous studies link pressure-induced superconductivity in these materials to a density-wave (DW) state.
Understanding the DW state is critical for elucidating the superconducting mechanism in RP nickelates.

Purpose of the Study:

To comprehensively investigate the ambient-pressure density-wave (DW) transition in La4Ni3O10 single crystals.
To determine the nature and evolution of the DW order in this material.
To provide insights into the relationship between DW states and superconductivity in RP nickelates.

Main Methods:

Utilized high-quality La4Ni3O10 single crystals.
Employed 139La nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) techniques.
Analyzed data to probe charge and spin order development.

Main Results:

Observed a two-stage evolution of the DW order.
Identified a short-range charge order below ~150 K in the inner Ni-O layer, with enhanced spin fluctuations.
Confirmed a DW transition at ~133 K, establishing long-range charge and spin orders across all Ni-O planes.

Conclusions:

The layer-dependent DW transition in La4Ni3O10 suggests a mechanism involving interlayer coupling and electronic structure differences.
The findings offer a new framework for understanding DW states in RP nickelates and their connection to superconductivity.
This research is pivotal for advancing the understanding of high-temperature superconductivity mechanisms.