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Magnetic field sorting of superconducting graphite particles with Tc>400K (2024)
It has been claimed that graphite hosts superconductivity at room temperature, although all efforts to isolate it have been vain. Here we report a separation method that uses magnetic field gradients to sort the superconducting from normal grains out of industrial graphite powders. We have obtained a concentrate of above room temperature superconducting particles. Electrical resistance measurements on agglomerates of sorted grains of three types of graphite show transition temperatures up to T$_{c{_{onset}}} \sim$ 700K with zero resistance up to $\sim$ 500K. Magnetization measurements confirm these values through jumps at \textit{T$_c$} in the zero field cooled curves, and by the occurrence diamagnetic hysteretic cycles shrinking with temperature. Our results open the door towards the study of above room temperature superconducting ill-stacked graphite phases.
Authors: Manuel Núñez-Regueiro, Thibaut Devillers, Eric Beaugnon, Armand de Marles, Thierry Crozes, Sébastien Pairis, Christopher Swale, Holger Klein, Olivier Leynaud, Abdelali Hadj-Azzem, Frédéric Gay, Didier Dufeu Here we report a separation method that uses magnetic field gradients to sort the superconducting from normal grains out of industrial graphite powders. Magnetization measurements confirm these values through jumps at \textit{T$_c$} in the zero field cooled curves, and by the occurrence diamagnetic hysteretic cycles shrinking with temperature.
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