{
  "abstract": "Medium and high-entropy alloys have emerged as a promising class of superconducting materials because their intrinsic chemical disorder can simultaneously enhance mechanical robustness and modify superconducting properties. Here, we present a combined experimental and first-principles investigation of the structural, superconducting, electronic, and local lattice-distortion characteristics of the mechanically robust medium-entropy alloy $\\text{Nb}_{0.45}\\text{Ta}_{0.25}\\text{Ti}_{0.15}\\text{Hf}_{0.15}$. The material shows type-II superconductivity with a transition temperature $T_C^{onset} \\approx 7.8 ~\\mathrm{K}$. A high critical current density of $J_c = 0.48 \\times 10^{6}~\\mathrm{A/cm^2}$ is observed, and this is attributed to strong vortex pinning at grain boundaries. Specific-heat analysis indicates a strong electron-phonon coupling ($λ$ = 1.07) with a large isotropic s-wave superconducting gap. Density functional theory calculations explicitly model the intrinsic chemical disorder, predict a stable body-centered cubic phase. These calculations further reveal a metallic electronic structure with substantial Ti- and Ta-derived states at the Fermi level. Additionally, our results quantify a pronounced disorder-induced local lattice distortion ($Δd = 0.086$ A), providing a microscopic basis for the experimentally observed enhanced vortex-pinning landscape. Remarkably, the alloy also exhibits an unusually large Kadowaki-Woods ratio, placing it close to the heavy-fermion regime and indicating enhanced electronic correlations beyond conventional alloy superconductors. Our results demonstrate that entropy-engineered chemical disorder can stabilize robust superconductivity, promote strong flux pinning, and induce correlated electronic behavior, establishing refractory medium-entropy alloys as a promising platform for next-generation superconducting materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.32449",
  "author_total": 9,
  "authors": [
    {
      "name": "Pooja Chourasia"
    },
    {
      "name": "Samiul Sk"
    },
    {
      "name": "Nikita Sharma"
    },
    {
      "name": "B. Vignolle"
    },
    {
      "name": "Abhishek Sarkar"
    },
    {
      "name": "Olivier Toulemonde"
    },
    {
      "name": "Sanjoy Mahatha"
    },
    {
      "name": "S. K. Panda"
    },
    {
      "name": "Sourav Marik"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dvb9vt7kbpa8q.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.32449",
  "fulltext_url": null,
  "id": "dvb9vt7kbpa8q",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.32449",
  "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.supr-con"
    ],
    [
      "openalex",
      "2210|High Entropy Alloys Studies"
    ]
  ],
  "openalex": "W7223649792",
  "pdf_url": "https://arxiv.org/pdf/2610.32449",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dvb9vt7kbpa8q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.32449",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.32449"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Interplay of Chemical Disorder, Vortex Pinning, and Electron Correlations in the Mechanically Robust Medium-Entropy Alloy Superconductor $\\text{Nb}_{0.45}\\text{Ta}_{0.25}\\text{Ti}_{0.15}\\text{Hf}_{0.15}$",
  "title_text": "Interplay of Chemical Disorder, Vortex Pinning, and Electron Correlations in the Mechanically Robust Medium-Entropy Alloy Superconductor Nb_0.45Ta_0.25Ti_0.15Hf_0.15",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/dvb9vt7kbpa8q",
  "venue": "arXiv",
  "versions": []
}