 In 1973 found to have "T"c of 23 K, which remained the highest ambient-pressure "T"c until the discovery of the cuprate high-temperature superconductors in 1986 (see below).In 1986, J. Georg Bednorz and K. Alex Mueller discovered superconductivity in a lanthanum-based cuprate perovskite material, which had a transition temperature of 35 K (Nobel Prize in Physics, 1987) and was the first of the high-temperature superconductors.It was shortly found (by Ching-Wu Chu) that replacing the lanthanum with yttrium, i.e.