{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f5be249a6bc3b6887e463f16f47d2c5f8b1fc67e2ab27ca550dd6fff6e525b8d","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"bba28b04a73bbf082636678cea8f1cb500f3233e405b9bac5375b5744de2ebbe","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.sit-anomalous-metal.intrinsic-saturation","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Some thin superconducting films stop losing resistance on cooling and level off at a small value. The dispute is whether this is a genuine state of matter or a result of electrical noise and stray radiation that keep the electrons warmer than the thermometer.","posed_since":"","precise":"In $2\\mathrm{D}$ superconducting films and arrays (amorphous InOx, MoGe, Ta, transition-metal dichalcogenide superconductors, Josephson-junction arrays) tuned by $B$, gate or disorder near the superconductor-insulator transition, $\\rho(T)$ saturates below $T \\sim 0.1\\,T_c$ at $1e-3\\ \\text{to}\\ 1e-1$ of the normal-state value. Determine whether the saturation survives when electron temperature and external radiation are independently controlled (filtered leads, shielding, noise thermometry), i.e. whether $\\rho(T \\to 0) > 0$ holds in a finite parameter range.","problem_ref":null,"references":"","settled_by":"Measurements with calibrated electron thermometry and progressively improved radiation filtering in several material classes, showing whether the saturation disappears or stays unchanged.","status_note":"Radiation filtering removed the saturation in amorphous InOx and 2H-NbSe2 (Tamir et al., Science Advances 5, eaau3826, 2019), while other groups report saturation that persists with filtering in other films; no consensus as of 2026.","title":"Is the anomalous metal a true zero-temperature 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