Superconductivity at oxydes interface

Superconductivity has been discovered at the interface between two insulators, namely SrTiO$_{3}$ and LaAlO$_{3}$ [1], which can be tuned by applying a gate voltage [2]. We have recently measured the properties of such heterostructures at low temperature. The carrier density can be modulated by field effect, and so the superconducting and normal properties. We will present a study of the phase diagram and an analysis of the superconductor-insulator transition observed at low carrier density. We will also discuss the possibility to observe superconductivity in other oxides interfaces. \\[4pt] [1] N. Reyren et al, Science 317, 1196 (2007) \\[0pt] [2] A. Caviglia et al, Nature 456, 624 (2008)