{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b010638330f8159254d33258d9f9abdbf7465d8c176a6be272badb716ae6b275","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"3bf10bdcc7cf0a86983ca5fd826857c5cdeef9e403c28910f6323fb7631c62ab","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":"1","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":null,"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":"b4b75ff0c70cf5671429b9fb89c50704ada0cab4ee0e1be6e0ee986b669f9fe8"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ae57f25c691cc3350877688539c4f41c4857d49c22004249bae4e69e49cc666b","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"abadff8e4843e6a81164432888b70886c84a23726a3ae18114f42d441261072e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"k0res_V5iiXKr4DF_JZmMkw6LZz-3GIeAVyIKuhVMnCy51FkkdnIrfEDsfkDjpGsSnDCOKZuHf_HZcYythTwDg"},"schema":"pubphys.envelope/1"},"record_hash":"ae57f25c691cc3350877688539c4f41c4857d49c22004249bae4e69e49cc666b","leaf_index":1189}