Administration of EMP-related Publications
year | 2018 |
author(s) | F. Arnold, J. NyƩki, J. Saunders |
title | Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy |
document type | Paper |
Keywords | Superconductivity Graphite |
source | Jetp Lett. 107, 577-578 (2018) |
doi | 10.1134/S0021364018090023 |
arxiv | https://arxiv.org/abs/1804.00179 |
EMP/Horizon2020 | This publication does not include a EMP/Horizon2020 acknowledgement. |
abstract | In this letter, we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy has been carried out at a temperature of 1.8 K using an etched aluminum tip. At zero field, a gap structure in the differential conductance is observed, showing a gap of meV. On applying magnetic fields of up to 500 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 14K. |