{
  "abstract": "Neutron damage lowers the transition temperature of REBCO conductors approximately linearly with displacement damage, and annealing recovers part of it, implicating phase stiffness. We model this competition as a two-dimensional XY lattice of the superconducting phase whose sites are damaged at a rate rising with local phase disorder and repaired stochastically, simulated by kinetic Monte Carlo. A mean-field reduction predicts bistability; the lattice shows no hysteresis or dependence on the initial state in the ranges tested (L ≤ 64) because the closure of the reduction fails. At zero field, symmetry-preserving repair restores spontaneous coherence and a twist-response stiffness (validated on clean and diluted lattices) above an apparent threshold in the repair-to-damage ratio, bracketed by finite-size scans (L ≤ 96) at ρ between 7.00 and 7.75 (ρ between 5.50 and 6.00 with neighbor-phase repair), against ρ ≈ 2.5 without feedback; the equilibrium formula underestimates the driven stiffness by up to 30%. Numerically, ρ controls the state ever better, as damage slows relative to phase relaxation. Finite-size analysis of random dilution estimates the stiffness loss at f ≈ 0.25 ± 0.01; clustered damage tolerates more. An illustrative effective mapping gives approximately ten model sites per dpa. The model is uncalibrated.",
  "abstract_shown": true,
  "affiliations": [
    "Independent researcher"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Leon Sandler",
      "orcid": "0009-0007-4584-808X"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8fsbcsnkt846p.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010100/v1",
  "fulltext_url": null,
  "id": "8fsbcsnkt846p",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010100/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3104|Theoretical and Computational Physics"
    ]
  ],
  "openalex": "W7219679044",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15010100/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/8fsbcsnkt846p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "10.26434/chemrxiv.15010100",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010100/v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3104|Theoretical and Computational Physics",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Damage–repair kinetics and phase stiffness in a site-diluted XY model: implications for irradiated superconductors",
  "title_text": "Damage–repair kinetics and phase stiffness in a site-diluted XY model: implications for irradiated superconductors",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/8fsbcsnkt846p",
  "venue": "ChemRxiv",
  "versions": []
}