Hydrogen sulfide becomes a superconductor at the surprisingly high temperature of 203 K (–70 °C), when under a pressure of 1.5 million bar, according to recent work done by physicists in Germany. This smashes the previous record for conventional superconductivity and takes it above the lowest temperature directly recorded at ground level on Earth (–89.2 °C or 184 K) for the first time. The researchers say the discovery could be a major step towards room-temperature superconductivity.


Allen super


Superconductors conduct electricity with zero resistance below a critical temperature. A second key characteristic is that below the critical temperature they expel magnetic fields – this is dubbed the Meissner effect. The ultimate goal is a superconductor that works at room temperature. This would dramatically improve the efficiency of electricity generation and transmission, and make current uses of superconductivity, such as superconducting magnets in particle accelerators, much simpler.