{
  "abstract": "We investigate the superconducting properties of RuO$_2$ films grown on TiO$_2$ substrates by combining film fabrication and transport measurement with \\textit{ab initio} calculation. Experimentally, we grow several RuO$_2$ (110) thin films on TiO$_2$ (110) substrates and observe superconductivity with critical temperature ($T_c$) of $\\sim$2.0 K in 20-nm and 30-nm RuO$_2$ (110) thin films. Theoretically, we study the superconductivity in both RuO$_2$ (110) and RuO$_2$ (100) epitaxial films within McMillan formalism of isotropic Migdal-Eliashberg theory. Among the salient results, the calculated phonon dispersion relations of all the considered RuO$_2$ films show that the epitaxial films are dynamically stable. Importantly, our \\textit{ab initio} calculations reveal that independent of the film orientation, the [001] compressive strain $ε_{[001]}$ pushes the flat Ru $d_{z^2}$-dominant bands towards the Fermi level ($E_F$), and significantly soften the out-of-plane acoustic phonon mode near the R point in the Brillouin zone, which substantially enhances the electron-phonon coupling (EPC) strength $λ$ and hence the calculated $T_c$ in the RuO$_2$ films. Remarkably, the amount of the phonon softening and the enhanced $T_c$ increase almost linearly with the increasing $ε_{[001]}$. The calculated $T_c$ for the films with thickness of $\\geq$ 20 nm agree well with the experimental $T_c$. These findings demonstrate that among other things, lattice mismatch strain provides an effective route for tuning phonon-mediated superconductivity in RuO$_2$ and other thin films.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.21163",
  "author_total": 7,
  "authors": [
    {
      "name": "Moeen ud din"
    },
    {
      "name": "Tsun-Sung Kuo"
    },
    {
      "name": "Yun-Chen Liao"
    },
    {
      "name": "Akhilesh Kr. Singh"
    },
    {
      "name": "Uddipta Kar"
    },
    {
      "name": "Wei-Li Lee"
    },
    {
      "name": "Guang-Yu Guo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5mr3czz9rkpe4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.21163",
  "fulltext_url": null,
  "id": "5mr3czz9rkpe4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.21163",
  "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",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7222439653",
  "pdf_url": "https://arxiv.org/pdf/2610.21163",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5mr3czz9rkpe4.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.21163",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.21163"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Strain-enhanced superconductivity in RuO$_2$ thin films: Joint experimental and theoretical studies",
  "title_text": "Strain-enhanced superconductivity in RuO_2 thin films: Joint experimental and theoretical studies",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/5mr3czz9rkpe4",
  "venue": "arXiv",
  "versions": []
}