{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"03191fe7e4ee9d4838f5297185dcdf19a1c611dd990f2f1f9776ffca455ed401","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ae57f25c691cc3350877688539c4f41c4857d49c22004249bae4e69e49cc666b","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"3a81409c50cd25219cfa60678c2d453ec849a004b1df60ed092e4d74c26aec7c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.tc-limits.ambient-room-temperature","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"The best superconductor at normal pressure works up to about 151 K, roughly minus 120 degrees Celsius; whether any material can reach room temperature without huge pressure is unknown.","posed_since":"","precise":"Determine whether any thermodynamically stable or long-lived metastable material has $T_c \\ge 300\\ \\mathrm{K}$ at ambient pressure. The ambient-pressure record is 151 K in pressure-quenched HgBa2Ca2Cu3O8+d (2026). An answer is a reproduced zero-resistance and Meissner measurement above 300 K at 1 bar, or a proof that a defined class of realistic materials cannot exceed a stated $T_c$ below 300 K.","problem_ref":"ae57f25c691cc3350877688539c4f41c4857d49c22004249bae4e69e49cc666b","references":"","settled_by":"Independent replication of resistive and magnetic transitions above 300 K at ambient pressure.","status_note":"Pressure quench of $\\mathrm{HgBa2Ca2Cu3O8}+d$ raised the ambient-pressure record from $133\\,\\mathrm{K}$ to $151\\,\\mathrm{K}$ (2026); claims of room-temperature superconductivity in nitrogen-doped lutetium hydride (2023) and LK-99 (2023) were not reproduced.","title":"Can any material superconduct at room temperature and ambient pressure?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e5a9d7a135d8f12a54fa63a7de75019487f7a2da1be1bb3d4c919d0e72f9f8b5","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ac5a2af562f9732f259bd849bababa3dfa17b0fd5ab47fd6016ec297d1581b14","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"xhrdfLSxgtRm8zLOMelAV8bXLZywJVZOP4dBjvaPS9lRpkUrEx18UZvMS2T3zxGKOywnD_EFqGAi5-i5gKshAg"},"schema":"pubphys.envelope/1"},"record_hash":"e5a9d7a135d8f12a54fa63a7de75019487f7a2da1be1bb3d4c919d0e72f9f8b5","leaf_index":3076}