Researchers demonstrate 'hot' superconductivity between roughly 69.5 F (20.8 C) and roughly 282 C (541 F) at high pressure (180 gigapascals) User snooshoe, in the Reddit Science subreddit, 22 Mar 2022
Hot Lanthanum Hydride Superconductivity above 550 K - still under high pressure only (PDF ArXiv) User ZephirAWT, in the Science: Uncensored. Science with no political censorship by Mods subreddit, 08 Jun 2020
Evidence for hot superconductivity well above room temperature (at very high pressure) User beautiful_deadman, in the Physics subreddit, 06 Jun 2020