The nickelate that the Argonne team has created is a quasi-two-dimensional trilayer compound, meaning that it consists of three layers of nickel oxide that are separated by spacer layers of praseodymium oxide. (sciencedaily.com)
Three days later, Zhong - Xian Zhao of the IoP reported that praseodymium oxygen fluorine iron arsenide (PrO1 - xFxFeAs) has a «critical temperature» of 52 kelvin. (sciencemag.org)
This was achieved by coupling it with a material called praseodymium cerium copper oxide (PCCO). (sciencedaily.com)