{
  "abstract": "ScAu$_2$Al is the Heusler superconductor with the highest reported transition temperature, Tc, close to 5 K. Here, we combine high-resolution ac calorimetry and electrical-transport measurements with first-principles-based Eliashberg calculations. The large specific-heat jump, $ΔC/{γ_nT_c} =$ 2.2, well above the weak-coupling BCS value of 1.43, together with an electron-phonon coupling constant $λ = $1.1, establishes ScAu2Al as a strong-coupling superconductor. The electronic specific heat is described better by a two-gap α model, with $2Δ_S/k_BT_c = $ 4.1 and $2Δ_L/k_BT_c = $ 4.8, than by a single-gap model. The thermodynamic upper critical field follows a conventional WHH-like temperature dependence with $B_{c2}(0) = 0.18$ T, whereas the resistively determined critical field reaches values about three times larger and exhibits a pronounced positive curvature. We attribute the enhanced resistive field scale to superconductivity in disordered grain-boundary and interfacial regions. The experimental results are supported by calculations of the heat capacity and upper critical field within the Eliashberg formalism using Fermi-surface and electron-phonon parameters obtained from first-principles calculations",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21845",
  "author_total": 12,
  "authors": [
    {
      "name": "Jozef Kačmarčík"
    },
    {
      "name": "Zuzana Pribulová"
    },
    {
      "name": "Yevhen Petrenko"
    },
    {
      "name": "Gabriel Kuderowicz"
    },
    {
      "name": "Paweł Wójcik"
    },
    {
      "name": "Michał J. Winiarski"
    },
    {
      "name": "Szymon M. Królak"
    },
    {
      "name": "Filip Košuth"
    },
    {
      "name": "Pavol Szabó"
    },
    {
      "name": "Tomasz Klimczuk"
    },
    {
      "name": "Bartlomiej Wiendlocha"
    },
    {
      "name": "Peter Samuely"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0b91s4qyqvzqj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21845",
  "fulltext_url": null,
  "id": "0b91s4qyqvzqj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21845",
  "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": "W7213884197",
  "pdf_url": "https://arxiv.org/pdf/2609.21845",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0b91s4qyqvzqj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.21845",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21845"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Strong-coupling multigap superconductivity in the Heusler compound ScAu$_2$Al",
  "title_text": "Strong-coupling multigap superconductivity in the Heusler compound ScAu_2Al",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/0b91s4qyqvzqj",
  "venue": "arXiv",
  "versions": []
}