{"schema":"pubphys.bundle/1","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 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