{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"34c9eee12ade323aea998fe9aff1a92aee0faa656adee023034fb2c924118cc8","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","cdeabbeea29a0e0a73646cc5ad97161b617805327ba35f4e49f91a7f93c949de"],"salt":"99475a442ced39bafe4405afc0260aa60cb3801327d7c18d6448133238b0530c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.phonon-thermal-hall.intrinsic-or-defect","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"cdeabbeea29a0e0a73646cc5ad97161b617805327ba35f4e49f91a7f93c949de","relation":"special_case"}],"plain":"The effect could come from the phonons themselves or from the way they scatter off impurities. SrTiO3, where it is large, is a clean place to decide.","posed_since":"","precise":"For SrTiO3 with $\\kappa_{xy}/\\kappa_{xx}$ up to $\\sim 3e-3$ at $9e4\\,\\mathrm{G}$ near the $\\kappa_{xx}$ maximum, determine whether $\\kappa_{xy}$ arises from band-intrinsic phonon chirality (for example involving the soft polar mode and structural domains) or from extrinsic skew scattering, by establishing how $\\kappa_{xy}$ scales with $\\kappa_{xx}$ and with controlled defect density (oxygen vacancies, isotope substitution).","problem_ref":null,"references":"","settled_by":"$\\kappa_{xy}$ measured on crystals with independently quantified defect density, combined with first-principles phonon Berry curvature for SrTiO3.","status_note":"In SrTiO3 disorder and strain suppress $\\kappa_{xy}$ and annealing partly restores it without changing $\\kappa_{xx}$ (Xiang et al., npj Quantum Materials 11, 40, 2026, arXiv 2511.08932); the authors read this as an intrinsic lattice effect sensitive to imperfections, not yet tied to a microscopic mechanism.","title":"Intrinsic versus defect-driven phonon thermal Hall effect in SrTiO3","topic_ref":"046be39fdf1a48ed3142232d4b04a481e5d83239067e46a752877f036dcaa5c1"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f50a75152339e28336a55824c774f0efcd2d2f1cf1a8f8960703be6182972062","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"515035f4e9e9617be7bfaf802c8ba69616d474275f6d41d90e331cb3ba8df786","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"qaGDiay4HyEUH6c5e-80ZUZlqjcdI44t8PBuEtjKicwiXd2FgUvR48Csj6uLb14jgOfRyTk1o-PCabJF4D8CBA"},"schema":"pubphys.envelope/1"},"record_hash":"f50a75152339e28336a55824c774f0efcd2d2f1cf1a8f8960703be6182972062","leaf_index":1128}