Compare · Superconductors
HgBa2Ca2Cu3O8+δ (Hg-1223) vs MgB2
RANKED BY CRITICAL TEMPERATURE TC AT AMBIENT PRESSURE (KELVIN)
#1 VS #6
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); MgB2 ranks #6 (39 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 06 of 8
Critical temperature Tc at ambient pressure (kelvin)
39 K
MakerAkimitsu group
Date2001
Verified04 Sept 2026
Evidence
Nagamatsu, Nakagawa, Muranaka, Zenitani, Akimitsu, Nature 410, 63–64 (2001): superconductivity at 39 K in magnesium diboride at ambient pressure. Binary intermetallic; widely replicated and used in wires.Try another pair
More HgBa2Ca2Cu3O8+δ (Hg-1223) matchups
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