TC is a few Kelvins in classical metallic superconductors
The new era in superconductivity research began in 1986 when a Swiss group reported HTS in Ba-doped LaCuO3, a ceramic oxide material
Ba-doped
In just a few years, many HTS-materials were found with TC over 100 K and soon liquid nitrogen (LN2) cooled HTS-magnets were proposed for electric appliances