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Magnetic field sorting of superconducting graphite particles with T$_c$$>$400K

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arxiv 2410.18020 v1 pith:HH7N3R4A submitted 2024-10-23 cond-mat.supr-con

classification cond-mat.supr-con
keywords graphitesuperconductingtemperaturefieldroomabovebeengrains
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abstract

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.

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    cond-mat.supr-con 2025-09 unverdicted novelty 6.0 of 10

    Boron-doped ultrathin carbon nanotubes in zeolite show magnetization, specific heat, resistance, and point-contact signatures attributed to superconductivity with Tc between 220 and 250 K, though zero resistance is no...

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