{
  "abstract": "Hydrogen-rich materials under pressure are candidates for conventional phonon-mediated superconductivity, but first-principles electron--phonon-coupling (EPC) calculations are computationally demanding. We develop an interpretable multistage workflow for prioritizing binary hydride superconductors before full EPC calculations. Using controlled cubic $X_m$H$_n$ prototypes at 200~GPa, we introduce the spectral moment $A_1$ as an intermediate measure of electron--phonon perturbation strength. In its linewidth-based construction, $A_1$ remains finite as harmonic phonons soften, allowing related structures with imaginary harmonic modes to be screened; it does not establish superconductivity or physical realizability for unstable structures. For dynamically stable cubic systems, $A_1$ correlates strongly with the H-$1s$ density-of-states fraction at the Fermi level, $α$, a projected Fermi-surface descriptor, $β$, and atomic number density, $ρ$. These trends are summarized heuristically by $A_1\\approx hαβρ$, where $h$ is framework- and pressure-dependent; the descriptor is used for ranking, not as a universal $T_c$ predictor. We incorporate $αβρ$ and enthalpic competitiveness into a three-stage evolutionary search comprising multiobjective structural screening, harmonic-phonon stability filtering, and coarse density-functional perturbation-theory (DFPT) EPC calculations. Application to more than 100,000 binary hydride structures at 50 and 200~GPa identifies candidates and prioritizes NaH$_6$ structural families. Higher-accuracy calculations show that $Pm\\bar{3}m$ NaH$_6$ is dynamically stable down to 50~GPa and has a harmonic Allen--Dynes estimate of $T_c\\approx230$~K. The framework combines electronic descriptors with progressively more expensive stability and EPC calculations for scalable hydride exploration.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35582",
  "author_total": 2,
  "authors": [
    {
      "name": "Tianran Chen"
    },
    {
      "name": "Taner Yildirim"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6ajvytbn6yw2c.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35582",
  "fulltext_url": null,
  "id": "6ajvytbn6yw2c",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.35582",
  "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.supr-con"
    ],
    [
      "openalex",
      "1908|High-pressure geophysics and materials"
    ]
  ],
  "openalex": "W7214736927",
  "pdf_url": "https://arxiv.org/pdf/2609.35582",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6ajvytbn6yw2c.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.35582",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35582"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Periodic Trends and a Physics-Based Multistage Search for High-$T_c$ Hydride Superconductors",
  "title_text": "Periodic Trends and a Physics-Based Multistage Search for High-T_c Hydride Superconductors",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/6ajvytbn6yw2c",
  "venue": "arXiv",
  "versions": []
}