Superconductivity at the LaAlO3/SrTiO3 interface

We report on the structural characterization of LaAlO₃/SrTiO₃ interfaces and on their transport properties. LaAlO₃ films were prepared using pulsed laser deposition onto TiO₂ terminated (001) SrTiO₃ substrates inducing a metallic conduction at the interface. Resistance and Hall effect measurements reveal a sheet carrier density between 0.4 and 1.2 × 10¹⁴ electrons cm^-2 at room temperature and a mobility of ~300 cm² V^-1 s^-1 at low temperatures. A transition to a superconducting state is observed at a temperature of ~200 mK. The superconducting characteristics display signatures of 2D superconductivity.