Superconductivity in Single-CrystallineSr1-xLaxTiO3

Abstract
Superconductivity has been observed in single-crystalline Sr 1- x La x TiO 3 samples for x = 0.001 and 0.009, which were previously classified as nonsuperconducting semiconductors. The relation between the critical temperature T c and the carrier density n is comparable with those previously observed in Nb-doped or reduced SrTiO 3 systems. The apparent universality of the relation suggests that T c in the doped SrTiO 3 system is predominantly determined by n and independent of the method of doping.