Compare · Superconductors
YBa2Cu3O7−δ (YBCO) vs SmFeAsO1−xFx
RANKED BY CRITICAL TEMPERATURE TC AT AMBIENT PRESSURE (KELVIN)
#4 VS #5
CHECKED 06 SEPT 2026
Side by side
Verdict
YBa2Cu3O7−δ (YBCO) ranks #4 of 8 on Critical temperature Tc at ambient pressure (kelvin) (93 K); SmFeAsO1−xFx ranks #5 (55 K).
Rank 04 of 8 · leads
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.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