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Imaging the Meissner effect in pressurized bilayer nickelate with integrated multi-parameter quantum sensor.
Junyan Wen1,2, Yue Xu1,2, Gang Wang1,2
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
National Science Review
|October 3, 2025
Summary
Researchers confirmed the Meissner effect in La3Ni2O7-δ using quantum sensors, resolving debates about high-temperature superconductivity in this nickelate material under pressure.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Sensing
Background:
- High-temperature superconductivity in La3Ni2O7-δ near 80 K has garnered significant interest.
- While zero resistance is observed under pressure, the Meissner effect in this material remains debated.
Purpose of the Study:
- To provide compelling evidence for the Meissner effect in La3Ni2O7-δ under high pressure.
- To clarify the controversy surrounding the superconducting properties of bilayer nickelates.
- To advance the application of quantum sensing for high-pressure measurements.
Main Methods:
- Utilized shallow nitrogen-vacancy (NV) centers in diamond anvil cells as *in situ* quantum sensors.
- Performed simultaneous measurements of magnetic field expulsion (Meissner effect), Raman spectra, and magnetic imaging.
- Employed field-cooling and field-warming protocols to detect magnetic field expulsion.
Main Results:
- Observed clear evidence of magnetic field expulsion, confirming the Meissner effect in polycrystalline La3Ni2O7-δ.
- Demonstrated the capability of diamond quantum sensors to detect weak demagnetization signals.
- Correlated incomplete structural transformations, linked to oxygen ion displacement, with non-superconducting regions.
Conclusions:
- The study resolves the controversy regarding the Meissner effect in La3Ni2O7-δ.
- Highlights the utility of diamond quantum sensors for probing superconductivity under extreme conditions.
- Provides insights into the relationship between structure and superconductivity in nickelates.
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