20 Year 2030 2010 1990 1970 1950 1930 1910 2050 Hg Nb NbC NbN Nd-Al-Ge Nb3 Ge LaBaCuO LaSrCuO(1986) YBaCuO(2/87) BiCaSrCuO(1/88) TiCaSrCuO(2/88) HgCaBaCuO(4/93) ? TiCaBaCuO(6/91) Room temperature 1986 Bednorz ,& Müller 1913 Nobel Heike Kamerlingh Onnes 4K