Compare · Superconductors
HgBa2Ca2Cu3O8+δ (Hg-1223) vs YBa2Cu3O7−δ (YBCO)
RANKED BY CRITICAL TEMPERATURE TC AT AMBIENT PRESSURE (KELVIN)
#1 VS #4
CHECKED 06 SEPT 2026
Side by side
Verdict
HgBa2Ca2Cu3O8+δ (Hg-1223) ranks #1 of 8 on Critical temperature Tc at ambient pressure (kelvin) (135 K); YBa2Cu3O7−δ (YBCO) ranks #4 (93 K).
Rank 01 of 8 · leads
Critical temperature Tc at ambient pressure (kelvin)
135 K
MakerChu / Schilling groups
Date1993
Verified04 Sept 2026
Evidence
Ambient-pressure record in the cuprate family. Huang, Meng, Chu et al., Physica C 217 (1993): resistivity vanishes below 134 K after oxygenation; Nature 365, 323 (1993) then reports the same compound above 150 K only under high pressure. Later single-crystal work optimises Tc max to 133 K. npj Quantum Materials (2025) still treats Tc ≈ 134 K as the ambient-pressure record. Ranking uses the long-replicated ~135 K ambient figure, not the pressure result.Rank 04 of 8
Critical temperature Tc at ambient pressure (kelvin)
93 K
MakerWu / Chu group
Date1987
Verified04 Sept 2026
Evidence
First superconductor above liquid-nitrogen temperature. Widely replicated ambient-pressure Tc ≈ 93 K for optimally doped YBCO. Cited here as the canonical 90 K-class cuprate against which Hg-1223 is compared in the 2025 npj Quantum Materials Hg-1223 paper.Try another pair
Source Peer-reviewed papers: Nature 365, 323 (1993); Phys. Rev. Lett. 60, 2539 (1988); Jpn. J. Appl. Phys. 27, L209 (1988); Chin. Phys. Lett. 25,…
Last checked 06 Sept 2026