{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e6acfc345fc863c3a3b2c27ab04f8be2e16309fefb790aa017b3579f57ef6498","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","f4e33d26cb561018733630b2c9744cf4941b7231ba777659e8efd67210aa2b3c"],"salt":"d9cc541dc370c2ef676742f393dda173c2fc0917b3c8d8c132f66dd5de665e65","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.one-over-f-noise.dutta-horn-test","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"f4e33d26cb561018733630b2c9744cf4941b7231ba777659e8efd67210aa2b3c","relation":"special_case"}],"plain":"One standard explanation says 1/f noise comes from many defects that hop over energy barriers of different heights. It predicts a fixed link between how the noise spectrum bends and how the noise changes with temperature, and whether real metal films obey it quantitatively is not settled.","posed_since":"1979","precise":"In the Dutta-Horn model $S(f, T)$ is a superposition of Lorentzians from thermally activated fluctuators with rates $\\left(1/\\tau_0\\right) \\exp(-E/T)$ and a smooth activation-energy distribution $D(E)$; it predicts $\\alpha(f, T) = 1 - (d \\ln S/d \\ln T - 1)/\\ln(2 \\pi f \\tau_0)$, where $\\alpha = -d \\ln S/d \\ln f$. For thin metal films (for example Au, Cu, Ag, Bi) over $f \\sim 1e-3 \\text{ to } 1e3\\,\\mathrm{Hz}$ and $T \\sim 10 \\text{ to } 500\\,\\mathrm{K}$, determine whether this relation holds with a single $\\tau_0$, and whether $D(E)$ inferred from the noise matches $D(E)$ obtained independently (from internal friction or defect spectroscopy).","problem_ref":null,"references":"","settled_by":"Noise spectra over at least six decades of $f$ at many temperatures on one film, with the fluctuator energy distribution measured independently, testing the predicted relation with $\\tau_0$ as the only parameter.","status_note":"","title":"Does the Dutta-Horn fluctuator model describe 1/f noise in metal 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