{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"265918e791a67a81fe47c6dd28bcb5d089a65e354768e8c1900e6ac4e4c978b2","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4b0b7a8cc6c7f5a51101a4588f34dbc37e1ff5869b80fce007c642c7c79ffdab","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"63596c683822c63fba0840557b566654dfaeb6a7060a4b11db02fa332950fd93","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":"2","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":"4b0b7a8cc6c7f5a51101a4588f34dbc37e1ff5869b80fce007c642c7c79ffdab","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 $\\mathrm{Mg_2IrH_6}$ 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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"da688e2268fd7ab9a069d6ec5fda183ebba6e0e34691402d36132e5aa0f57353","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"80e1b2fb5df0fdf691428141feafba1b6a47aadc5cc049d748b913e0c9c3476c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"loD57tfp8lWkr4-G4uPdaOPaPACxgwsI8_poKU-_RCA4mbYFBFSL4Quxo7YMuwcGkwDqQy0xl_BMmHE4LMgnAw"},"schema":"pubphys.envelope/1"},"record_hash":"da688e2268fd7ab9a069d6ec5fda183ebba6e0e34691402d36132e5aa0f57353","leaf_index":2856}