{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e3313b527a847ed8428873f2ccae2ecf5f5af0a185db04659409b6134722eb6d","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","55615a03bfc157c39f29e579b86af0cdfab4347440038fffed38db8a9a205062"],"salt":"c0e7093ece90b9d5306121827f64cc3c99381cd1be6ba945520d00e0a2df8d2b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.strange-metals.extended-criticality","kind":"phenomenon","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"55615a03bfc157c39f29e579b86af0cdfab4347440038fffed38db8a9a205062","relation":"special_case"}],"plain":"A zero-temperature phase transition should affect a metal most strongly at a single value of the tuning parameter, yet in overdoped cuprates a part of the resistance stays linear in temperature over a wide range of doping.","posed_since":"2009","precise":"In overdoped La2-xSrxCuO4, Tl2Ba2CuO6+d and Bi2Sr2CuO6+d with superconductivity suppressed by field, $\\rho(T) = \\rho_0 + A_1 T + A_2 T^{2}$ with $A_1$ nonzero from $p$* to near the end of the superconducting dome, decreasing with p and correlated with $T_c$ (Cooper et al., Science 2009). Determine whether this reflects an extended critical phase, spatial inhomogeneity mixing Fermi-liquid and critical regions, or a single critical point with a broad crossover. An answer is a model that reproduces $A_1(p)$, the $A_1\\ \\text{versus}\\ T_c$ correlation, the magnetoresistance and the reduced Hall carrier density of the overdoped strange metal (Putzke et al., Nature Physics 2021).","problem_ref":null,"references":"","settled_by":"Spatially resolved probes (NMR linewidths, scanning noise or nano-imaging) testing inhomogeneity on the same overdoped crystals, combined with a model fitted to $A_1(p)$, Hall and magnetoresistance data in two families.","status_note":"Magnetotransport across the overdoped range (Ayres et al., Nature 2021) was described by an incoherent T-linear channel coexisting with conventional carriers; the origin of that channel is unexplained.","title":"Why T-linear resistivity persists across the overdoped cuprate 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