{
  "abstract": "Stabilizing two-dimensional superconductivity in a bulk superconducting material provides a unique route to exploring the interplay between superconducting condensates of different dimensionalities. Here, we present evidence for a distinct surface-associated superconducting state in Pb-substituted NiBi$_3$. NiBi$_{2.8}$Pb$_{0.2}$ exhibits a resistive onset at $T_{c,\\mathrm{onset}}^{*}\\approx8.1$~K, nearly twice the bulk superconducting transition temperature of approximately 4.1~K. The absence of a corresponding Meissner response or specific-heat anomaly at the higher-temperature transition supports its non-bulk origin. A cusp-like angular dependence of the critical field, well described by the two-dimensional Tinkham model, together with nonlinear current--voltage characteristics and signatures of a Berezinskii--Kosterlitz--Thouless transition, establishes the low-dimensional character of this superconducting state. Remarkably, the surface-associated superconductivity persists well beyond the bulk upper critical field, reaching a maximum ratio of $H_{c3}/H_{c2}\\approx4.3$, far exceeding the conventional Saint-James--de Gennes value of 1.695. These results demonstrate that Pb substitution can stabilize an anomalously enhanced low-dimensional superconducting state in NiBi$_3$, providing a platform for investigating superconductivity at the boundary of a bulk superconductor.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.33463",
  "author_total": 5,
  "authors": [
    {
      "name": "Anupam Barik"
    },
    {
      "name": "Subhadip Chakrabarty"
    },
    {
      "name": "Achintya Low"
    },
    {
      "name": "Sudip Pal"
    },
    {
      "name": "Setti Thirupathaiah"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dnve1edmgesbx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.33463",
  "fulltext_url": null,
  "id": "dnve1edmgesbx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.33463",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "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": "W7223810190",
  "pdf_url": "https://arxiv.org/pdf/2610.33463",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dnve1edmgesbx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.33463",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.33463"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Chemical Substitution as a Route to Anomalous Surface Superconductivity in NiBi$_3$",
  "title_text": "Chemical Substitution as a Route to Anomalous Surface Superconductivity in NiBi_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/dnve1edmgesbx",
  "venue": "arXiv",
  "versions": []
}