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Natterer FD, Ha J, Baek H, et al. Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene. Phys Rev B. 2016;93(4)doi: 10.1103/PhysRevB.93.045406.
Natterer, F. D., Ha, J., Baek, H., Zhang, D., Cullen, W., Zhitenev, N. B., Kuk, Y., & Stroscio, J. A. (2016). Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene. Physical review. B, 93(4), . https://doi.org/10.1103/PhysRevB.93.045406
Natterer, Fabian D, et al. "Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene." Physical review. B vol. 93,4 (2016). doi: https://doi.org/10.1103/PhysRevB.93.045406
Natterer FD, Ha J, Baek H, Zhang D, Cullen W, Zhitenev NB, Kuk Y, Stroscio JA. Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene. Phys Rev B. 2016 Jan 15;93(4). doi: 10.1103/PhysRevB.93.045406. Epub 2016 Jan 07. PMID: 27088134; PMCID: PMC4832425.
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Phys Rev B. 2016 Jan 15;93(4). doi: 10.1103/PhysRevB.93.045406. Epub 2016 Jan 07.

Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene.

Physical review. B

Fabian D Natterer, Jeonghoon Ha, Hongwoo Baek, Duming Zhang, William Cullen, Nikolai B Zhitenev, Young Kuk, Joseph A Stroscio

Affiliations

  1. Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
  2. Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA.
  3. Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea.
  4. Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea.

PMID: 27088134 PMCID: PMC4832425 DOI: 10.1103/PhysRevB.93.045406

Abstract

We report on spatial measurements of the superconducting proximity effect in epitaxial graphene induced by a graphene-superconductor interface. Superconducting aluminum films were grown on epitaxial multilayer graphene on SiC. The aluminum films were discontinuous with networks of trenches in the film morphology reaching down to exposed graphene terraces. Scanning tunneling spectra measured on the graphene terraces show a clear decay of the superconducting energy gap with increasing separation from the graphene-aluminum edges. The spectra were well described by Bardeen-Cooper-Schrieffer (BCS) theory. The decay length for the superconducting energy gap in graphene was determined to be greater than 400 nm. Deviations in the exponentially decaying energy gap were also observed on a much smaller length scale of tens of nanometers.

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