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arxiv: 1804.00179 · v1 · pith:RXUQ5I27new · submitted 2018-03-31 · ❄️ cond-mat.supr-con

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

Frank Arnold , Jan Nyeki , John Saunders This is my paper
classification ❄️ cond-mat.supr-con
keywords mathrmfieldmagneticpoint-contactapplyingdependentgraphitespectroscopy
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In this letter we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of micro-crystalline graphite. Magnetic field dependent point-contact spectroscopy was carried out at a temperature of $1.8\,\mathrm{K}$ using an etched aluminium tip. At zero field a gap structure in the differential conductance is observed, showing a gap of $\Delta = 4.2\,\mathrm{meV}$. On applying magnetic fields of up to $500\,\mathrm{mT}$, this gap gradually closes, following the theoretical prediction by Ginzburg and Landau for a fully flux-penetrated superconductor. By applying BCS-theory, we infer a critical superconducting temperature of $14\,\mathrm{K}$.

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