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Macroscopic-ranged proximity effect in graphite.

Bruno Cury Camargo1,2, Piotr Gierłowski2, Marek Kuzmiak3,4

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Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 8, 2021
PubMed
Summary
This summary is machine-generated.

Superconducting features were observed over millimeters in graphite, far exceeding typical ranges. This anomaly suggests pre-existing superconductivity within localized regions of the graphite material.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Proximity effect in superconductors typically induces features over short, micrometer-scale distances in adjacent materials.
  • Highly oriented pyrolytic graphite (HOPG) is a material of interest for its unique electronic properties.

Purpose of the Study:

  • To investigate and report the observation of proximity-induced superconducting features in HOPG over unexpectedly large distances.
  • To explore the underlying mechanisms responsible for the anomalous range of these features.

Main Methods:

  • Electrical current injection into HOPG using superconducting electrodes separated by millimeters.
  • Characterization of superconducting features induced by the proximity effect.

Main Results:

  • Observation of proximity-induced superconducting features in HOPG extending over macroscopic lengths (millimeters).
  • This observed range is significantly larger than typically seen in normal conductors, which usually do not exceed a few micrometers.
  • The anomalous range suggests the presence of pre-existing superconductivity in localized regions within the graphite.

Conclusions:

  • The macroscopic superconducting features in HOPG are attributed to the influence of localized, pre-existing superconducting regions within the material.
  • This finding challenges conventional understanding of proximity effects in graphite and suggests novel superconducting mechanisms may be at play.