{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"417c29681cb2082b8a31b0bd5da6be097bd2ee0684070f4c8655c1777b9895b4","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","8548a9674d797e52e0adba53855a3c20f4d617011f817466fcb52f5c41b110cd"],"salt":"a9f3ccd28991ec580ffc2936bffc0206b97235ca8ebffe34f4e4974a1083dd9e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.dilute-superconductivity.ferroelectric-critical-enhancement","kind":"phenomenon","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"8548a9674d797e52e0adba53855a3c20f4d617011f817466fcb52f5c41b110cd","relation":"special_case"}],"plain":"SrTiO3 is close to becoming ferroelectric, meaning its ions almost shift to create a permanent electric dipole. Pushing it closer, by replacing oxygen-16 with oxygen-18 or adding calcium, raises its superconducting temperature, and the reason is debated.","posed_since":"2015","precise":"18O substitution, Ca substitution and strain move n-doped SrTiO3 toward its ferroelectric quantum critical point and raise $T_c$, in some reports by about a factor of 2. Determine whether the enhancement is caused by pairing through the critical soft transverse-optical mode, which electron-phonon coupling is responsible (linear Rashba-type or bilinear two-phonon), and where $T_c$ peaks relative to the critical point (paraelectric side, at criticality, or inside the polar phase). An answer is a mechanism with a quantitative fit of $T_c$ versus distance to criticality and carrier density.","problem_ref":null,"references":"","settled_by":"Measurement of $T_{c}$ across the ferroelectric critical point at fixed n under continuous tuning (stress or isotope fraction) compared with a soft-mode pairing calculation with no free couplings.","status_note":"","title":"Does ferroelectric quantum criticality raise the $T_{c}$ of 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