{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fd4dc0cbc09b5d70a923147a60aebe24e3f238798981bccfd46da364ea2a51d4","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"e2bf1c993832326f86d1bdc934472346b708612234ecfdd94fafa3bbcb4d23cc","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.sit-anomalous-metal.critical-universality","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Theory predicted that at the switch between superconductor and insulator the film resistance takes a universal value set by Planck constant and the electron charge, with simple scaling laws. Experiments find different values and exponents in different films.","posed_since":"1990","precise":"The dirty-boson theory (Fisher 1990) predicts a universal critical sheet resistance $R_{c} = h/(4e^{2})$ and universal $z\\nu$ at the B- or disorder-tuned transition. Measured $R_{c}$ varies by a factor of several and $z\\nu$ ranges from $\\sim 0.6$ to above 2; Ga films show a divergent effective $z\\nu$ characteristic of a quantum Griffiths singularity (Xing et al. 2015). Classify the universality classes of the 2D transition with $1/r$ Coulomb interaction and quenched disorder, and determine whether $R_{c}$ and $z\\nu$ are universal within each class.","problem_ref":null,"references":"","settled_by":"Scaling analyses at $T$ far below the crossover scale in several material classes, with sample-to-sample comparison of $R_{c}$ and $z\\nu$, matched to a theory assigning each to a class.","status_note":"A discontinuous (first-order) disorder-driven transition was reported in amorphous InOx films (Charpentier et al., Nature Physics 21, 104, 2025), which would place at least some films outside any continuous universality class.","title":"Are critical resistance and exponents at the 2D superconductor-insulator transition 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