{
  "abstract": "We investigate the superconducting properties of a 1.2-μm-thick granular boron-doped diamond film, where tightly packed grains form a disordered network of Josephson junctions. The film exhibits a sharp superconducting transition at a critical temperature, T_c ~ 3 K. Its transport properties are well described by the Ambegaokar-Halperin theory of phase fluctuations. Direct measurements of the penetration depth using a two-coil mutual inductance technique reveal classic phase-fluctuation-dominated behavior: below T_c, the superfluid density (n_s) varies linearly over a wide temperature range - a hallmark of thermal phase fluctuations - before crossing over to a T^2 dependence at ultra-low temperatures. Both the large low-temperature penetration depth, λ(0) ~ 8.8 μm, and the slope of the linear ns variation in the thermal regime reveal a remarkably low superfluid stiffness in the range of 0.5-0.8 K. These results establish granular boron-doped diamond films as an excellent model system for investigating the role of long-wavelength phase fluctuations in three-dimensional superconductors.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.34319",
  "author_total": 8,
  "authors": [
    {
      "name": "Sulagna Dutta"
    },
    {
      "name": "Subhajit Chatterjee"
    },
    {
      "name": "Vivas Bagwe"
    },
    {
      "name": "Pritam Das"
    },
    {
      "name": "S. Anantha Bharathi"
    },
    {
      "name": "C. Nikhil"
    },
    {
      "name": "M. S. Ramachandra Rao"
    },
    {
      "name": "Pratap Raychaudhuri"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c9nvzerxja3v0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.34319",
  "fulltext_url": null,
  "id": "c9nvzerxja3v0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.34319",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7223783427",
  "pdf_url": "https://arxiv.org/pdf/2610.34319",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c9nvzerxja3v0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.34319",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.34319"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Phase fluctuations dominated superconductivity in a thick Granular Boron-Doped Diamond film",
  "title_text": "Phase fluctuations dominated superconductivity in a thick Granular Boron-Doped Diamond film",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/c9nvzerxja3v0",
  "venue": "arXiv",
  "versions": []
}