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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.18020 |
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| _version_ | 1866912083512131584 |
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| author | Núñez-Regueiro, Manuel Devillers, Thibaut Beaugnon, Eric de Marles, Armand Crozes, Thierry Pairis, Sébastien Swale, Christopher Klein, Holger Leynaud, Olivier Hadj-Azzem, Abdelali Gay, Frédéric Dufeu, Didier |
| author_facet | Núñez-Regueiro, Manuel Devillers, Thibaut Beaugnon, Eric de Marles, Armand Crozes, Thierry Pairis, Sébastien Swale, Christopher Klein, Holger Leynaud, Olivier Hadj-Azzem, Abdelali Gay, Frédéric Dufeu, Didier |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18020 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic field sorting of superconducting graphite particles with T$_c$$>$400K Núñez-Regueiro, Manuel Devillers, Thibaut Beaugnon, Eric de Marles, Armand Crozes, Thierry Pairis, Sébastien Swale, Christopher Klein, Holger Leynaud, Olivier Hadj-Azzem, Abdelali Gay, Frédéric Dufeu, Didier Superconductivity It has been claimed that graphite hosts superconductivity at room temperature, although all efforts to isolate it have been vain. Here we report a separation method that uses magnetic field gradients to sort the superconducting from normal grains out of industrial graphite powders. We have obtained a concentrate of above room temperature superconducting particles. Electrical resistance measurements on agglomerates of sorted grains of three types of graphite show transition temperatures up to T$_{c{_{onset}}} \sim$ 700K with zero resistance up to $\sim$ 500K. Magnetization measurements confirm these values through jumps at \textit{T$_c$} in the zero field cooled curves, and by the occurrence diamagnetic hysteretic cycles shrinking with temperature. Our results open the door towards the study of above room temperature superconducting ill-stacked graphite phases. |
| title | Magnetic field sorting of superconducting graphite particles with T$_c$$>$400K |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2410.18020 |