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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.19255 |
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| _version_ | 1866910196982349824 |
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| author | Wang, Y. Koo, T. H. Huang, R. Ng, Y. H. Lortz, T. T. Zhang, T. Chan, W. M. Hou, Y. Pan, J. Krämer, S. Demuer, A. Lortz, R. Wang, N. Sheng, P. |
| author_facet | Wang, Y. Koo, T. H. Huang, R. Ng, Y. H. Lortz, T. T. Zhang, T. Chan, W. M. Hou, Y. Pan, J. Krämer, S. Demuer, A. Lortz, R. Wang, N. Sheng, P. |
| contents | We report evidence for high temperature superconductivity in three dimensional networks of boron doped, ultrathin carbon nanotubes (CNTs) grown inside the ~5 Angstrom channels of ZSM-5 zeolite. Confinement stabilizes (2,1) CNTs that are otherwise dynamically unstable, while boron doping shifts the Fermi level toward a van Hove singularity, as supported by ab-initio calculations. The resulting CNT network exhibits multiple, mutually consistent signatures of superconductivity at ambient pressure. DC magnetization and AC susceptibility measurements reveal the onset of a Meissner response between 220 and 250 K, with compacted samples achieving up to 93% of full diamagnetic screening. Electrical transport shows a sharp resistive transition with extrapolated Tc about 239 K and vanishing resistance in optimized samples. Specific heat measurements display a reproducible anomaly at 233 to 236 K that broadens under magnetic field, consistent with strong superconducting fluctuations. Point contact spectroscopy identifies three superconducting gaps, including a leading gap of approximately 30 meV whose temperature dependence follows BCS expectations for Tc of about 224 K, and exhibits particle-hole symmetry and Andreev reflection. Remarkably, applying pressures below 0.1 kbar enhances Tc by nearly 100 K and modulates the room temperature resistance by more than three orders of magnitude, suggesting a pressure driven 1D to 3D crossover in the CNT network. These results identify boron doped ultrathin CNT networks as a promising carbon-based platform for near ambient temperature superconductivity and reveal an unusually large pressure sensitivity with potential technological relevance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19255 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Signature of high temperature superconductivity with giant pressure effect in networks of boron doped ultra-thin carbon nanotubes Wang, Y. Koo, T. H. Huang, R. Ng, Y. H. Lortz, T. T. Zhang, T. Chan, W. M. Hou, Y. Pan, J. Krämer, S. Demuer, A. Lortz, R. Wang, N. Sheng, P. Superconductivity We report evidence for high temperature superconductivity in three dimensional networks of boron doped, ultrathin carbon nanotubes (CNTs) grown inside the ~5 Angstrom channels of ZSM-5 zeolite. Confinement stabilizes (2,1) CNTs that are otherwise dynamically unstable, while boron doping shifts the Fermi level toward a van Hove singularity, as supported by ab-initio calculations. The resulting CNT network exhibits multiple, mutually consistent signatures of superconductivity at ambient pressure. DC magnetization and AC susceptibility measurements reveal the onset of a Meissner response between 220 and 250 K, with compacted samples achieving up to 93% of full diamagnetic screening. Electrical transport shows a sharp resistive transition with extrapolated Tc about 239 K and vanishing resistance in optimized samples. Specific heat measurements display a reproducible anomaly at 233 to 236 K that broadens under magnetic field, consistent with strong superconducting fluctuations. Point contact spectroscopy identifies three superconducting gaps, including a leading gap of approximately 30 meV whose temperature dependence follows BCS expectations for Tc of about 224 K, and exhibits particle-hole symmetry and Andreev reflection. Remarkably, applying pressures below 0.1 kbar enhances Tc by nearly 100 K and modulates the room temperature resistance by more than three orders of magnitude, suggesting a pressure driven 1D to 3D crossover in the CNT network. These results identify boron doped ultrathin CNT networks as a promising carbon-based platform for near ambient temperature superconductivity and reveal an unusually large pressure sensitivity with potential technological relevance. |
| title | Signature of high temperature superconductivity with giant pressure effect in networks of boron doped ultra-thin carbon nanotubes |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.19255 |