Abstract
We report on the formation of self-organized rows of pits in highly epitaxialLa2/3Sr1/3MnO3 thin films on top of substrates having different structural misfits by rf magnetronsputtering. The best-defined pits form in coherently grown films at a low misfit irrespectiveof its nature (tensile or compressive stress). It is also found that the pit rows align alongthe step edges, which indicates in-phase growth instability with the step edges, irrespectiveof the misfit. However, out-of-phase pit rows are also found when the terrace widthincreases due to a decrease of the miscut angle. Pit’s volume scales inversely withthe lattice mismatch suggesting that structural strain alone does not favor theformation of pits. The formation of pits is analyzed within a thermodynamic model.
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