Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy

@article{Arnold2018SuperconductingSI,
  title={Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy},
  author={F. Arnold and J. Ny{\'e}ki and J. Saunders},
  journal={JETP Letters},
  year={2018},
  volume={107},
  pages={577-578}
}
In this letter, we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy has been carried out at a temperature of 1.8 K using an etched aluminum tip. At zero field, a gap structure in the differential conductance is observed, showing a gap of Δ = 4.2 meV. On applying magnetic fields of up to 500 mT, this gap gradually closes… Expand
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