Effects of growth temperature, oxygen pressure, laser fluence and postannealing on transport properties of superconducting LaAlO 3 /KTaO 3 (111) interfaces.

The recent discovery of superconductivity at EuO (or LaAlO 3 )/KTaO 3 interfaces has attracted considerable research interest. However, an extensive study on growth of these interfaces is still lacking. In this work, we have fabricated LaAlO 3 /KTaO 3 (111) interfaces by growing LaAlO 3 thin films on KTaO 3 (111) single-crystalline substrates by pulsed laser deposition. We investigated the effects of growth temperature, oxygen pressure, laser fluence, and postannealing on transport properties. We found that all these key growth parameters show important effects on transport properties, and discussed their possible mechanisms. Our present study provides useful knowledge to further optimize these interfaces.