2024/10/23 by Manuel Núñez-Regueiro, M. Núñez‐Regueiro, Núñez-Regueiro, Manuel +23 · 7 voices · 1 citation
Materials Science · #Graphite, nuclear technology, radiation studies #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.2410.18020
openalex publication_date 2024/10/23 · openalex created_date 2024/11/13 · openalex updated_date 2026/07/28
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_conset ∼ 700K with zero resistance up to ∼ 500K. Magnetization measurements confirm these values through jumps at Tc 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.