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Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene

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arxiv 1602.06831 v1 pith:FCETD5MV submitted 2016-02-22 cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci

Scanning Tunneling Spectroscopy of Proximity Superconductivity in Epitaxial Multilayer Graphene

Fabian D. Natterer , Jeonghoon Ha , Hongwoo Baek , Duming Zhang , William G. Cullen , Nikolai B. Zhitenev , Young Kuk , Joseph A. Stroscio This is my paper
classification cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci
keywords graphenesuperconductingwereenergyepitaxialaluminumdecayfilms
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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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    Quasiparticles eject from ballistic planar Josephson junctions at a phase-controlled angle scaling as √(Δ/μ), providing a kinematic probe of condensate momentum transfer.