Compare · Superconductors
HgBa2Ca2Cu3O8+δ (Hg-1223) vs SmFeAsO1−xFx
RANKED BY CRITICAL TEMPERATURE TC AT AMBIENT PRESSURE (KELVIN)
#1 VS #5
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); SmFeAsO1−xFx ranks #5 (55 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 05 of 8
Critical temperature Tc at ambient pressure (kelvin)
55 K
MakerRen / Zhao group
Date2008
Verified04 Sept 2026
Evidence
Ren, Che, Dong, Yang, Dai, Fang, Zhong, Chen, Wang, Sun, Wen, Xu, Zhao, Chin. Phys. Lett. 25, 2215 (2008): fluorine-doped samarium iron arsenide with Tc up to 55 K at ambient pressure. Highest well-replicated 1111-family iron-pnictide Tc; Kamihara et al. JACS 2008 LaFeAsO:F at 26 K is the parent discovery and is not listed separately.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