{
  "abstract": "We investigate the microwave response of sputtered Nb films as a function of biaxial film stress. Although transport measurements show nearly identical superconducting transition temperatures ($9.0\\pm 0.2$K) and residual resistance ratios across the stress series, microwave resonators fabricated from highly compressive films exhibit enhanced temperature-dependent loss and larger frequency shifts. A conventional single-phase Mattis--Bardeen description yields an effective critical temperature of $2.4\\pm0.2$K, approximately a factor of four below the value obtained from transport measurements. We show that the data are instead consistent with the presence of an additional low-gap component whose contribution increases with compressive stress. These results show that conventional transport measurements can overlook stress-dependent low-energy excitations that strongly influence microwave performance.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.26714",
  "author_total": 9,
  "authors": [
    {
      "name": "J. T. Paustian"
    },
    {
      "name": "Maciej Olszewski"
    },
    {
      "name": "Kiichi Okubo"
    },
    {
      "name": "Lingda Kong"
    },
    {
      "name": "B. L. T. Plourde"
    },
    {
      "name": "Ethan G. Arnault"
    },
    {
      "name": "Caleb W. Fink"
    },
    {
      "name": "Valla Fatemi"
    },
    {
      "name": "Ivan V. Pechenezhskiy"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b4tg1x09202qe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.26714",
  "fulltext_url": null,
  "id": "b4tg1x09202qe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.26714",
  "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.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7214078091",
  "pdf_url": "https://arxiv.org/pdf/2609.26714",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b4tg1x09202qe.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.26714",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.26714"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Evidence for a low-gap component in compressively stressed niobium thin films",
  "title_text": "Evidence for a low-gap component in compressively stressed niobium thin films",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/b4tg1x09202qe",
  "venue": "arXiv",
  "versions": []
}