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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Fully Suppressed Superconductivity in Nonferromagnetic Heavy Fermion/Superconductor Bilayers: Rocksalt-Type CeO/LaO.

Mikito Sekine1,2, Masamichi Negishi1, Satoshi Sasaki1

  • 1Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.

ACS Nano
|July 9, 2026
PubMed
Summary

Researchers explored superconductor/heavy-fermion heterostructures for strong pair-breaking effects. Fabricated CeO/LaO bilayers showed no superconductivity, demonstrating a significant proximity effect at the interface for novel superconducting devices.

Keywords:
heavy-fermion systemheteroepitaxial bilayerinterfacepair-breaking proximity effectrare-earth monoxiderocksalt-type structuresuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductor/ferromagnet heterostructures are known for breaking superconducting electron pairs.
  • Investigating alternative systems for strong pair-breaking proximity effects is crucial for advanced superconducting devices.

Purpose of the Study:

  • To explore superconductor/heavy-fermion heterostructures as a platform for strong pair-breaking proximity effects.
  • To fabricate and characterize heteroepitaxial bilayers of a superconductor and a heavy-fermion system.

Main Methods:

  • Fabrication of rocksalt-type CeO/LaO heteroepitaxial bilayers.
  • Characterization of superconducting properties of LaO thin films and CeO/LaO bilayers using low-temperature measurements.

Main Results:

  • LaO thin films exhibited superconductivity at temperatures between 4.4-5.2 K.
  • CeO/LaO bilayers showed no superconductivity down to 0.025 K, indicating a strong pair-breaking effect.
  • The heteroepitaxial interface between the superconductor (LaO) and the heavy-fermion system (CeO) was confirmed to induce a significant proximity effect.

Conclusions:

  • The superconductor/heavy-fermion system interface provides a robust platform for achieving strong pair-breaking effects.
  • This finding opens avenues for developing novel superconducting micro and nano devices leveraging the proximity effect.