In the early 1980s, Müller began searching for substances that would become superconductive at higher temperatures. The highest critical temperature ("T"c) attainable at that time was about 23 K. In 1983 Müller recruited Georg Bednorz to IBM, to help systematically test various oxides. A few recent studies had indicated these materials might superconduct. In 1986 the two succeeded in achieving superconductivity in lanthanum barium copper oxide (LBCO) at a temperature of 35 K. Over the previous 75 years the critical temperature had risen from 11 K in 1911 to 23 K in 1973 where it had remained for 13 years. Thus 35 K was incredibly high by the prevailing standards of superconductivity research. This discovery stimulated a great deal of additional research in high-temperature superconductivity, leading to the discovery of compounds such as BSCCO ("T"c = 107 K) and YBCO ("T"'c = 92 K).