{
 "note": "Record-Tc claims since 1986, as counted in the section on proof. The failed claims are taken from Wikipedia's article 'Room-temperature superconductor' (read 6 October 2026) and one further report (Grockowiak et al., 2022). The article omits older reports that were never established, so eleven undercounts them. 'Failed' means refuted, retracted or never corroborated by a second laboratory. The 138 K of the mercury cuprate with partial thallium substitution (1995) is counted with the 1993 mercury-cuprate record.",
 "survived": [
  {
   "material": "La-Ba-Cu-O",
   "tc_K": 35,
   "year": "1986"
  },
  {
   "material": "YBa2Cu3O7",
   "tc_K": 93,
   "year": "1987"
  },
  {
   "material": "Bi-Sr-Ca-Cu-O",
   "tc_K": 110,
   "year": "1988"
  },
  {
   "material": "Tl-Ba-Ca-Cu-O",
   "tc_K": 125,
   "year": "1988",
   "basis": "from memory; not checked against a source"
  },
  {
   "material": "HgBa2Ca2Cu3O8+d",
   "tc_K": 133,
   "year": "1993"
  },
  {
   "material": "HgBa2Ca2Cu3O8+d under pressure",
   "tc_K": 164,
   "year": "1993 to 1994"
  },
  {
   "material": "H3S at 155 GPa",
   "tc_K": 203,
   "year": "2015"
  },
  {
   "material": "LaH10 at 170 GPa",
   "tc_K": 250,
   "year": "2018 to 2019"
  }
 ],
 "failed": [
  {
   "claim": "Bi cuprate films near room temperature",
   "year": "1993 to 1997",
   "at_or_above_273K": true
  },
  {
   "claim": "oxygen-doped diamond",
   "year": "2000",
   "at_or_above_273K": true
  },
  {
   "claim": "PdHx at 260 K",
   "year": "2003 to 2007",
   "at_or_above_273K": false
  },
  {
   "claim": "water-treated graphite above 300 K",
   "year": "2012",
   "at_or_above_273K": true
  },
  {
   "claim": "Ag/Au nanostructures up to 286 K",
   "year": "2018",
   "at_or_above_273K": true,
   "source": "arXiv:1807.08572; critique arXiv:1808.02929"
  },
  {
   "claim": "lanthanum superhydride at 294 K rising to 556 K after heating",
   "year": "2020",
   "at_or_above_273K": true,
   "source": "arXiv:2006.03004",
   "basis": "that it was never corroborated is from memory"
  },
  {
   "claim": "carbonaceous sulfur hydride, 288 K at 267 GPa",
   "year": "2020",
   "at_or_above_273K": true,
   "outcome": "retracted 2022"
  },
  {
   "claim": "Y-Pd-H, 262 K at 187 GPa",
   "year": "2021",
   "at_or_above_273K": false
  },
  {
   "claim": "nitrogen-doped lutetium hydride, 294 K at about 1 GPa",
   "year": "2023",
   "at_or_above_273K": true,
   "outcome": "retracted 2023"
  },
  {
   "claim": "LK-99, 400 K or more",
   "year": "2023",
   "at_or_above_273K": true
  },
  {
   "claim": "graphite with line defects at room temperature",
   "year": "2023 to 2024",
   "at_or_above_273K": true
  }
 ],
 "open": [
  {
   "claim": "LaSc2H24, 298 K onset near 260 GPa",
   "year": "2025"
  },
  {
   "claim": "pressure-quenched HgBa2Ca2Cu3O8+d, onsets to 151 K at ambient pressure",
   "year": "2026"
  },
  {
   "claim": "boron-doped quenched carbon, 112 to 187 K at ambient pressure",
   "year": "2026"
  }
 ]
}