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Updated: Jan 19, 2026

Fabrication and Characterization of Superconducting Resonators
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Nodal superconducting exchange coupling.

A Di Bernardo1,2, S Komori3, G Livanas4

  • 1Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, UK. ad659@cam.ac.uk.

Nature Materials
|September 19, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel superconducting spin valve effect in YBa2Cu3O7-δ. This effect, driven by quasiparticle excitations, allows superconductivity to control magnetic states, enabling new oxide memory devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconducting spin valves traditionally rely on magnetic exchange energy influencing superconducting condensate.
  • The superconducting transition temperature (ΔΤc) is sensitive to magnetic alignment and superconductor thickness (dS).

Purpose of the Study:

  • To investigate a novel superconducting spin valve mechanism in a d-wave superconductor.
  • To explore the role of nodal quasiparticle excitation states in modulating superconductivity.
  • To demonstrate the potential for all-oxide superconducting memory devices.

Main Methods:

  • Fabrication of YBa2Cu3O7-δ thin films sandwiched between ferromagnetic Pr0.8Ca0.2MnO3 layers.
  • Measurement of superconducting transition temperature shifts (ΔΤc) as a function of superconductor thickness (dS).
  • Analysis of the influence of magnetization alignment on superconducting properties.

Main Results:

  • Observed a superconducting spin valve effect driven by nodal quasiparticle excitations.
  • Reported ΔΤc values approaching 2 K, with sign oscillations over length scales exceeding 100ξ.
  • Demonstrated that superconductivity can reinforce antiparallel magnetization alignment for specific dS.

Conclusions:

  • The study reveals a new mechanism for superconducting spin valves based on d-wave superconductor properties.
  • These findings open possibilities for developing all-oxide superconducting memory devices.
  • Superconductivity's ability to modulate magnetic states is a key outcome.