https://www.sciencedaily.com/releases/2022/01/220128100759.htm

"It has been widely accepted that traditional superconductors result from electrons interacting with phonons, where the phonons pair two electrons as an entity and the latter can run in a material without resistance," said Yao Wang, assistant professor of physics and astronomy at Clemson University.

However, in cuprates, strong repulsions known as the Coulomb force were found between electrons and were believed to be the cause of this special and high-temperature superconductivity.