{
  "abstract": "Since the discovery of superconductivity in $\\mathrm{MgB_2}$, metal diborides have attracted significant attention. Among these, osmium diboride ($\\mathrm{OsB_2}$), crystallizing in an orthorhombic structure (space group $Pmmn$) with puckered boron layers, has been classified as a low-$κ$ Type-II superconductor ($T_c \\approx 2.1~\\mathrm{K}$). Here, we report experimental evidence establishing that $\\mathrm{OsB_2}$ is in fact a rare nonelemental Type-I superconductor. Our identification is supported by three primary experimental hallmarks: (i) a pronounced Differential Paramagnetic Effect (DPE) peak in AC susceptibility ($χ_{ac}$) measurements under static DC magnetic fields, signaling the intermediate state; (ii) a field-induced crossover to a divergent first-order phase transition in specific heat ($C/T$); and (iii) pronounced magnetic hysteresis in field-ramped transitions indicative of supercooling.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08239",
  "author_total": 1,
  "authors": [
    {
      "name": "Yogesh Singh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/09fpnry2hp0d6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08239",
  "fulltext_url": null,
  "id": "09fpnry2hp0d6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08239",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08239",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/09fpnry2hp0d6.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08239",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08239"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Experimental Evidence for Type-I Superconductivity in $\\mathrm{OsB_2}$",
  "title_text": "Experimental Evidence for Type-I Superconductivity in OsB_2",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:30Z",
  "url": "https://research.draconitic.com/paper/09fpnry2hp0d6",
  "venue": "arXiv",
  "versions": []
}