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Giant proximity effect in single-crystalline MgB2 bilayers.

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We observed a giant proximity effect (GPE) in damaged and undamaged magnesium diboride (MgB2) bilayers. This effect fully recovers degraded superconductivity, offering new avenues for superconducting electronics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Giant proximity effect (GPE) is crucial for understanding superconductivity but difficult to fabricate.
  • Previous research on GPE is limited due to technological challenges in junction fabrication.

Purpose of the Study:

  • To report and investigate the giant proximity effect (GPE) in single-crystalline magnesium diboride (MgB2) bilayers.
  • To explore the mechanism behind the unpredicted GPE between identical superconducting materials.

Main Methods:

  • Fabrication of single-crystalline MgB2 bilayers with one layer damaged by cobalt-ion irradiation (S') and one undamaged layer (S).
  • Characterization of superconducting properties, including the upper critical field (μ0Hc2) and in-field critical current density (Jc).
  • Analysis of electron diffusion and electronic structures to understand the GPE mechanism.

Main Results:

  • Demonstrated a GPE in S'/S MgB2 bilayers, where superconductivity in the damaged layer (S') was fully recovered.
  • Observed recovery of superconductivity in S' despite its thickness being significantly larger than the superconducting coherence length of S.
  • Reported significant enhancement in both upper critical field (μ0Hc2) and in-field critical current density (Jc) of the S'/S bilayers.

Conclusions:

  • The study provides evidence for an unpredicted GPE between the same superconducting materials (MgB2).
  • Electron diffusion from the undamaged to the damaged layer and similar electronic structures are proposed as origins for the GPE.
  • The findings offer a blueprint for designing superconducting multilayers for GPE research and technological applications.