Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: [TT] Transport: Graphene 2 (jointly with MA, HL, DY, DS, O)
O 83.8: Talk
Friday, March 30, 2012, 11:30–11:45, BH 334
Field Effect Superconductivity in Multigraphene — •Ana Ballestar1, Srujana Dusari1, Jose Barzola-Quiquia1, Pablo Esquinazi1, Robson da Silva2, and Yakov Kopelevich2 — 1Division of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany — 2Instituto de Fisica, Unicamp, 13083-970 Campinas, Sao Paulo, Brasil
We have studied the temperature and magnetic field dependence of the electrical resistivity of mesoscopic tens of nanometers thick multigraphene samples as a function of bias voltage applied perpendicular to the graphene planes. We found that the resistivity changes asymmetrically with the bias voltage. For large and negative bias voltages the resistivity shows non-percolative superconducting-like transitions at T ∼ 15 … 20 K . The transition can be suppressed at high enough magnetic fields applied normal or parallel to the main plain of the samples. We discuss the obtained results in terms of electric field induced superconductivity at localized near surface regions of the graphite sample.