{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ffb771efed1b0e9510bcfee8b2d8c10efe6898282553f8370bd2316b13a0ebac","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1d0aa4e5d1b42cda8b16a20cc93586bdff23f3fd958d2702e20324142dcc32c2","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.sit-anomalous-metal.cooper-pair-insulator","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"On the insulating side, some films such as amorphous indium oxide and titanium nitride show a giant resistance peak in a magnetic field and signs that electrons are still bound in pairs. How paired electrons form an insulator, and what sets its conduction, is open.","posed_since":"","precise":"In amorphous InOx, TiN and nanopatterned Bi films on the insulating side of the field-tuned transition, $\\rho \\sim \\operatorname{exp}(T_{0}/T)$ with $T_{0}$ peaking at a field $B_{\\mathrm{peak}}$, the magnetoresistance peak spans several orders of magnitude, and patterned films show $h/2e$ periodic magnetoresistance (Stewart et al. 2007). Explain the pair-localization mechanism and $T_{0}(B)$, and determine whether abrupt current jumps in the $I-V$ curves reflect electron overheating (Altshuler, Kravtsov, Lerner and Aleiner 2009) or a distinct phase (proposed superinsulator).","problem_ref":null,"references":"","settled_by":"Electron-temperature measurement during nonlinear transport plus local probes of pair density in the insulator, compared with a theory of localized preformed pairs.","status_note":"","title":"Nature of the Cooper-pair insulator beyond the transition","topic_ref":"4ea1b2157b1b787fb021cb15b1d29d6f209084de7dc217220a6bd4b6bab225a2"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"387c78650fe6ba2d48d45d84bf572342120c702dbd87fb90db1537ccf4db9a11","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3c8c2d774e5fb24cc6e758a3a56948a934654cd8529e2c1168385c2d79fbabc1","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"3g6iE05kK06lrPFWjzrz1TmiI-0joHcrFdL58xKfMeF2Nug9KgElMgJv1tNYiixx_KA8p3S4Vjlmyi8UTk2dDg"},"schema":"pubphys.envelope/1"},"record_hash":"387c78650fe6ba2d48d45d84bf572342120c702dbd87fb90db1537ccf4db9a11","leaf_index":1157}