{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"12e2db79de321612bc157754b00cba0dbafc6940efab3385e2dcd5cb351c4cab","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"ae9d7281f4cabcdfd6cc7218f29850fda04d4747a5c5115ccf760a0d9c6279f6","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.fese-sto-interface.ktao3-orientation","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Electron gases at the surface of KTaO3 superconduct at about $2\\,\\mathrm{K}$ on one crystal face and at much lower temperature, or not at all, on another, which no simple theory explains.","posed_since":"2021","precise":"Two-dimensional electron gases at EuO/KTaO3 and LaAlO3/KTaO3 interfaces superconduct with $T_c \\sim 2\\,\\mathrm{K}$ for (111) and $\\sim 1\\,\\mathrm{K}$ for (110) orientation (2021), while (001) interfaces show much lower or no $T_c$. Identify the pairing interaction and the origin of the orientation dependence, for example coupling to soft transverse-optic phonons that symmetry allows only for some orientations.","problem_ref":null,"references":"","settled_by":"Systematic $T_{c}$ versus carrier density and orientation, compared with a microscopic calculation of electron coupling to the soft polar mode for each orientation.","status_note":"","title":"Why does KTaO3 interface superconductivity depend on crystal orientation?","topic_ref":"1f178118a7bca814d2960d4dbbdc31dda05ef4474c27f73ec247fd952130449c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"1afbf36ada10d223763e9c45ec0a163448627eb80e8c94fa6ad3b37de10cced9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"97792f534647994fba5891ba0c3a7f9a2a965ea25414c73ebb941aa762955fc8","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"dp9NPQnW-97OrlNcyifrwSdLo8UdDiQwlzE41-F4g9XEVC2r_erLKzhsqVATLQ6nAhzWF0NJtuTMlUAIh33EDQ"},"schema":"pubphys.envelope/1"},"record_hash":"1afbf36ada10d223763e9c45ec0a163448627eb80e8c94fa6ad3b37de10cced9","leaf_index":986}