{
  "abstract": "We present data consistent with a high-temperature collective electronic phase with superconductivity-like characteristics in three dimensional networks of boron doped, ultrathin carbon nanotubes (CNTs) grown inside the ~5 Å 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 an electronic condensate with the typical characteristics of a high temperature superconductor 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 ≈ 239 K and vanishing resistance in optimized samples. Specific heat measurements display a reproducible anomaly at 233-236 K that broadens under magnetic field, consistent with strong fluctuations. Point contact spectroscopy identifies three energy gaps, including a leading gap of ~30 meV whose temperature dependence follows BCS expectations for Tc ≈ 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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2509.19255",
  "author_total": 14,
  "authors": [
    {
      "name": "Y Wang"
    },
    {
      "name": "T H Koo"
    },
    {
      "name": "R Huang"
    },
    {
      "name": "Y H Ng"
    },
    {
      "name": "T T Lortz"
    },
    {
      "name": "T Zhang"
    },
    {
      "name": "W M Chan"
    },
    {
      "name": "Y Hou"
    },
    {
      "name": "J Pan"
    },
    {
      "name": "S Krämer"
    },
    {
      "name": "A Demuer"
    },
    {
      "name": "R Lortz"
    },
    {
      "name": "N Wang"
    },
    {
      "name": "P Sheng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/56swsqwddsp5t.bib",
  "cited_by": 1,
  "doi": "10.1016/j.carbon.2026.122250",
  "fulltext_url": null,
  "id": "56swsqwddsp5t",
  "issns": [],
  "landing_url": "https://hal.science/hal-05801600v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "hal",
      "2.phys.cond.cm-s"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W4415251609",
  "pdf_url": "https://hal.science/hal-05801600/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/56swsqwddsp5t.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:57Z",
      "native_id": "hal-05801600",
      "source": "hal",
      "url": "https://hal.science/hal-05801600v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.cond",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Signatures of a high-temperature collective electronic phase with superconductivity-like characteristics and a giant pressure effect in networks of boron-doped ultrathin carbon nanotubes",
  "title_text": "Signatures of a high-temperature collective electronic phase with superconductivity-like characteristics and a giant pressure effect in networks of boron-doped ultrathin carbon nanotubes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:57Z",
  "url": "https://research.draconitic.com/paper/56swsqwddsp5t",
  "venue": "HAL",
  "versions": []
}