Superconductivity at the LaAlO3/SrTiO3interface

S. Gariglio (1) , N. Reyren , A. D. Caviglia , J.-M. Triscone

1 Univ Geneva, DQMP, 24 Quai Ernest, CH-1211 Geneva 4, Switzerland

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 1.2·10 14 electrons/cm 2 at room temperature and mobility of ∼ 300 cm 2 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.

Domaines: Physique [physics]

S. Gariglio, N. Reyren, A. D. Caviglia, J.-M. Triscone. Superconductivity at the LaAlO3/SrTiO3interface. Journal of Physics: Condensed Matter, 2009, 21 (16), pp.164213. ⟨10.1088/0953-8984/21/16/164213⟩. ⟨hal-01591058⟩