{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"49ffc2506a1790774e7f1aecaffe6d0659adb845329911a489726c60a599e14a","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["1afbf36ada10d223763e9c45ec0a163448627eb80e8c94fa6ad3b37de10cced9","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"02a3cd6940434e8be637fa2ae0e1ec15f191eafc54e2146c106cb70a9c88ed4e","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":"2","parents":[],"plain":"Electron gases at the surface of $\\mathrm{KTaO_3}$ 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/$\\mathrm{KTaO_3}$ and $\\mathrm{LaAlO_3}$/$\\mathrm{KTaO_3}$ 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":"1afbf36ada10d223763e9c45ec0a163448627eb80e8c94fa6ad3b37de10cced9","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 $\\mathrm{KTaO_3}$ interface superconductivity depend on crystal orientation?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"93521af49e9fea978abf3e2a0ae8b9b690738915f0ef7daf20cbab9b0f024a87","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ca30fc84b19a3cffaed2547dd77a474a1e397c9de386081f6305dae893d298cd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"5QLzo-t7If0lHaHJ1_3XfIcd4yb3rQ2qnNdd2a3jCw3x-JymTmcLMbGsb4tv_jY1LxHXmv9MVQhMDHE5vgpCBg"},"schema":"pubphys.envelope/1"},"record_hash":"93521af49e9fea978abf3e2a0ae8b9b690738915f0ef7daf20cbab9b0f024a87","leaf_index":2796}