Pulsed laser deposited La2-xSrxCuO4+delta thin films

High quality La2-xSr2CuO4+delta thin films have been grown with different s train and oxygen content. Strain was controlled by depositing either compre ssive or tensile SrLaAlO4 buffer layer on SrTiO3 substrate. Oxygen content was controlled by whether or not using an ozone/molecular oxygen mixture du ring cooling to achieve better oxygen uptake. We found that both full oxyge nation and compressive in-plane strain are critical for the superconducting properties of the La2-xSrxCuO4+delta thin films, and perhaps the compressi ve strain makes the oxygenation much easier.