The Korean Society of Superconductivity and Cryogenics’ review committee on Wednesday said LK-99, an alleged room-temperature superconductor created by a South Korean research team, has not shown any key features of superconductivity. “There is no ground for saying that LK-99 is a superconductor,” the committee said in a report, stressing that it showed no signs of superconductivity in a series of t...