https://www.sciencealert.com/physicists-have-officially-smashed-the-record-for-high-temperature-superconductivity
Physicists Have Officially Smashed The Record For High-Temperature Superconductivity MICHELLE STARR 23 MAY 2019 Scientists in Germany have hit a new superconductivity <https://www.sciencealert.com/superconductivity> milestone - achieving a resistance-free electrical current at the highest temperature yet: just 250 Kelvin, or -23 degrees Celsius (-9.4 degrees Fahrenheit).
