{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"95163bf86ba3c5de9488935015db30c12eba54c41cf1ecc92e189b1f80a94eeb","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f1f7bdee381cb99c13149c1d1f25eea44c0918e9e55a74c6b37940fa4e57a80c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.nickelates.strain-tc-ceiling","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Squeezing bilayer nickelate films by growing them on a substrate with smaller atomic spacing mimics high pressure; the question is whether this can reach the 80 K seen under pressure.","posed_since":"2025","precise":"Determine the highest $T_c$ attainable in bilayer nickelate films at ambient pressure through epitaxial compressive strain, rare-earth substitution and oxygenation, and whether it can match the $\\sim 80 \\text{ to } 96\\,\\mathrm{K}$ reached under hydrostatic pressure. An answer is a measured zero-resistance $T_c$ with Meissner response, or a model of $T_c$ versus in-plane lattice constant and c-axis structure that predicts the ceiling.","problem_ref":null,"references":"","settled_by":"Films with zero resistance and diamagnetic shielding at the predicted ceiling, together with structural refinement showing the strain state.","status_note":"Onset $T_{c}$ rose from about $40\\ \\mathrm{K}$ (early 2025) to about $63\\ \\mathrm{K}$, with zero resistance near $37\\ \\mathrm{K}$, in (La,Pr)3Ni2O7 films on SrLaAlO4 (reported late 2025, published 2026).","title":"How high can $T_{c}$ reach in ambient-pressure nickelate films","topic_ref":"1addbb7974855cb74617281e1add5f43c41622b4152f1b5d331c3da3827c5d62"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"213a8e32a9af1b62bce6d9c0b9e498233701f766a5136c76569b377330ef5d6d","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"26b3c193262762de42ebd39a67a790b8767e0d764c60d3369dad476a51460cb0","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"m0hXRc-N3NeK1RlyN_AyQ7ftJUQzlzXhzDp2Fl0LejJTyOh7Vfp7yH9WIqpiRFix5KrSj2vBf-qBjURXJys1BQ"},"schema":"pubphys.envelope/1"},"record_hash":"213a8e32a9af1b62bce6d9c0b9e498233701f766a5136c76569b377330ef5d6d","leaf_index":1111}