{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"07338bfaf459fe9295cce6453423bdabb4acaef60628c4aebb6da1aa3a490996","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["55870f737b0da9d54f7bed7c2935185e9c5207301dba5d762c5c10870a472abe","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"d3a284dbec628621f96912898b6e501d257ee020e7e428cd7a5faf6892f9417d","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":"2","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 $10^{-3}\\ \\text{to}\\ 10^{-1}$ 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":"55870f737b0da9d54f7bed7c2935185e9c5207301dba5d762c5c10870a472abe","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 phase?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"3a03c6b0fe7a11ac5fcfbd419d4b841c00b2b3bdb3bd4c1494ef885a67693033","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"064b20e63e23f5888848c3a7549e73f5574515ba0d7d1af1dbaae9a6ab1bb10c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"swyjR547BDUCxYrGbFwa5rXxxBli3f81POKH3EBVftQqmF3Yy5-CKcMpQpgCWb7n_Xq4Lq1cDT6EK2emwd-zAw"},"schema":"pubphys.envelope/1"},"record_hash":"3a03c6b0fe7a11ac5fcfbd419d4b841c00b2b3bdb3bd4c1494ef885a67693033","leaf_index":3032}