{
  "abstract": "In this work, we have presented S-I-S Josephson junctions with $\\rmα$-Ta electrodes and a ${\\rm TaO}_x$ barrier. We grew base and top $α$-Ta electrodes using seed layer engineering, showing both Nb and ${\\rm TaN}_x$ are viable seed layer choices, and particularly emphasize that at room temperature a re-seed layer is required to nucleate $\\rmα$-Ta for the top electrode. However, we note that the choice of seed layer can have subtle implications on the electrical tunneling behavior of the junctions. We used room-temperature probing of variable junction areas, combined with Ambegaokar-Baratoff physics, to characterize the wafer scale critical current densities. For 0.4 $μ$m$^2$ junctions, we found junction spreads as low as 2.0% across the 20 x 20 mm chip relevant for device performance. The entire process was carried out using standard industry foundry processing using 150 mm wafer tooling, which is an important step towards proving that Ta-based junctions can be implemented at scale. We have successfully fabricated and tested junctions with $\\rmα$-Ta electrodes and a ${\\rm TaO}_x$ insulating tunnel barrier, demonstrating that this is a material platform which merits further investigation and studies for potential application in classical and quantum superconducting technologies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.04982",
  "author_total": 27,
  "authors": [
    {
      "name": "Trent Borman"
    },
    {
      "name": "Cameron Bullock"
    },
    {
      "name": "Cole Chason"
    },
    {
      "name": "Bradley Christensen"
    },
    {
      "name": "Jonathan Cochran"
    },
    {
      "name": "Emad Din"
    },
    {
      "name": "Evan Donohue"
    },
    {
      "name": "Jason Flagg"
    },
    {
      "name": "A. L. Graninger"
    },
    {
      "name": "Eric Jones"
    },
    {
      "name": "Robert Klaes"
    },
    {
      "name": "Shawn Keebaugh"
    },
    {
      "name": "Erin Kennedy"
    },
    {
      "name": "John Kula"
    },
    {
      "name": "Jason Lapano"
    },
    {
      "name": "Melissa Loving"
    },
    {
      "name": "Christopher Pasco"
    },
    {
      "name": "Devika Pathan"
    },
    {
      "name": "Tam Pham"
    },
    {
      "name": "Timothy Pillsbury"
    },
    {
      "name": "Robert Pownall"
    },
    {
      "name": "Paige Quarterman"
    },
    {
      "name": "Jacob Ruf"
    },
    {
      "name": "Jade Simmons"
    },
    {
      "name": "Nathan Siwak"
    },
    {
      "name": "Joel Strand"
    },
    {
      "name": "Yong Mo Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4a32z4c2m48wj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.04982",
  "fulltext_url": null,
  "id": "4a32z4c2m48wj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.04982",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2611.04982",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4a32z4c2m48wj.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.04982",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.04982"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Ta-based S-I-S junctions for integrated superconducting Electronics",
  "title_text": "Ta-based S-I-S junctions for integrated superconducting Electronics",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:18Z",
  "url": "https://research.draconitic.com/paper/4a32z4c2m48wj",
  "venue": "arXiv",
  "versions": []
}