{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e5bea45a707981a30ae8a7ccf8734391b2293c5d7cf120c0e0bcd8634226926f","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","55615a03bfc157c39f29e579b86af0cdfab4347440038fffed38db8a9a205062"],"salt":"1c6aca678edf1f537fec0d2d4491fb92ca47608a724cac1b41b4aaa3f59a6cb4","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.strange-metals.hall-angle","kind":"phenomenon","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"55615a03bfc157c39f29e579b86af0cdfab4347440038fffed38db8a9a205062","relation":"special_case"}],"plain":"In cuprates the resistance grows linearly with temperature while the Hall angle, the deflection of current by a magnetic field, behaves as if a second scattering rate grows as temperature squared.","posed_since":"1991","precise":"In optimally doped cuprates $\\rho_{xx} \\sim T$ while cot(theta_H) = rho_xx/rho_xy ~ A + B T^2 over a wide range. Determine whether this requires two distinct relaxation rates (transport and Hall) or follows from a single anisotropic scattering rate on a Fermi surface with hot and cold regions. An answer is a model that reproduces both laws and their doping dependence with one parameter set.","problem_ref":null,"references":"","settled_by":"Angle-dependent magnetoresistance mapping of the momentum-resolved scattering rate, fed into a Boltzmann or non-quasiparticle calculation that yields both $\\rho_{xx}(T)$ and $\\operatorname{cot}(\\theta_{H})(T)$.","status_note":"","title":"Why Hall angle and resistivity follow different temperature laws","topic_ref":"bfd78216bee7da77225ac2973e7d9a78ff7a1c51ad977d9d7c3327e70d7ac174"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a86192b2af51a2db41ce759971b8e2a9b81ef03f1564f2469e0e1b7d953d803a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"6e76d2dc2341efb90bd1e4d82478c1859a852ae84270355fc4e9e26d58a3da6c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"euhTifaivgD-JYFhbRa-juwRZyEIKlovrepdbsgk12NHhsMKX_OOkuQN5S8fSNNodk-car7A5ZNzZGTqoN2LBg"},"schema":"pubphys.envelope/1"},"record_hash":"a86192b2af51a2db41ce759971b8e2a9b81ef03f1564f2469e0e1b7d953d803a","leaf_index":1181}