1201.0454 (Carmela Aruta et al.)

Critical influence of target-to-substrate distance on conductive
properties of LaGaO3/SrTiO3 interfaces deposited at 10-1 mbar oxygen pressure    [PDF]

Carmela Aruta, Salvarore Amoruso, Giovanni Ausanio, Riccardo Bruzzese, Emiliano Di Gennaro, Marco Lanzano, Fabio Miletto Granozio, Muhammad Riaz, Alessia Sambri, Umberto Scotti di Uccio, Xuan Wang

We investigate pulsed laser deposition of LaGaO3/SrTiO3 at 10-1 mbar oxygen background pressure, demonstrating the critical effect of the target-to-substrate distance, dTS, on the interface sheet resistance, Rs. The interface turns from insulating to metallic by progressively decreasing dTS. The analysis of the LaGaO3 plume evidences the important role of the plume propagation dynamics on the interface properties. These results demonstrate the growth of conducting interfaces at an oxygen pressure of 10-1 mbar, an experimental condition where a well-oxygenated heterostructures with a reduced content of oxygen defects is expected.

View original: http://arxiv.org/abs/1201.0454