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Structure of Superconducting Ca-intercalated Bilayer Graphene/SiC studied using Total-Reflection High-Energy Positron Diffraction

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arxiv 1906.11535 v3 pith:ZY7XTOBV submitted 2019-06-27 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords graphenebilayerca-intercalatedstructuresuperconductingatomicdiffractionhigh-energy
verification ladder T0 review T1 audit T2 compute T3 formal
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We have investigated the atomic structure of superconducting Ca-intercalated bilayer graphene on a SiC(0001) substrate using total-reflection high-energy positron diffraction. By comparing the experimental rocking-curves with ones calculated for various structural models using a full-dynamical theory, we have found that Ca atoms are intercalated in the graphene-buffer interlayer, rather than between the two graphene layers. From transport measurements, the superconducting transition was observed to be at Tc_onset = 4K for this structure. This study is the first to clearly identify the relation between the atomic arrangement and superconductivity in Ca-intercalated bilayer graphene.

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