{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"77aa95df6c6c062a69dae7ebd1a00bcb692b3817b9fd9267128985be9027f88e","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f90d2ee7ae005e8414746cc03d1c9a531daa530588c42426159d05974f26b83d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.hydrides.ambient-pressure-hydride","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Hydride superconductors need enormous pressure; the goal is a hydrogen-rich compound that keeps a high transition temperature, above liquid-nitrogen temperature, at normal pressure.","posed_since":"","precise":"Determine whether any thermodynamically stable or long-lived metastable hydride has $T_c > 77\\ \\mathrm{K}$ at ambient pressure. An answer is a synthesized compound with zero resistance and diamagnetic shielding above 77 K at 1 bar, or a computational search with stated completeness showing none exists among a defined class.","problem_ref":null,"references":"","settled_by":"Synthesis and characterization of a predicted candidate with resistive and magnetic transitions above 77 K at ambient pressure.","status_note":"Calculations (2024) predicted Mg2IrH6 with $T_{c}$ above $100\\,\\mathrm{K}$ at ambient pressure; no superconducting sample has been reported.","title":"Is there a hydride superconducting above 77 K at ambient pressure","topic_ref":"d8f6a90ffa2d9797ae166bd4e51b07a319dd484720f9647530fc1647474424b6"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4b0b7a8cc6c7f5a51101a4588f34dbc37e1ff5869b80fce007c642c7c79ffdab","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f03354ba3d55ab0c9b6e4538a47ceefada355a86c8d34c101822d2cfeba46371","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"351pqPmjHFdWSU3InKlszv-afyv9LGGpGWdb5smNSXlnyoQFeftO-W39cWcKwGD7wLHxuzIWOs0UFuf3Odz7Cw"},"schema":"pubphys.envelope/1"},"record_hash":"4b0b7a8cc6c7f5a51101a4588f34dbc37e1ff5869b80fce007c642c7c79ffdab","leaf_index":1029}