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c-axis expansion, Δc, of epitaxial STO thin films (≈200 nm) vs laser fluence, F, at three different target-to-substrate distances (DTS) grown at a substrate temperature TS = 720 °C in 0.2 mbar of oxygen background gas. The curves are visual guides. The orange squares mark the conditions for which XPS analyses of the thin films and of the corresponding ablation spots on the target were carried out.
(a) 1D spectra of the STO plume emission for three different values of the laser fluence, F: 0.6 J/cm2 (lower panel), 1.0 J/cm2 (middle panel), and 2.0 J/cm2 (upper panel). Each image is normalized to its own maximum intensity.
(a) 2D images of the STO plume emission for three different values of the laser fluence, F, at three delays, τ, after the laser pulse. (b) Position-time R-τ plots of the plume front for the three different values of the laser fluence of Fig. 3(a). The solid lines are fits according to the expansion model of Refs. 16 and 23.
Sr/Ti emission intensity ratio as a function of the distance from the target surface for laser ablation of STO in Ar background gas. The inset shows the temporal evolution of the plume front. The solid lines are visual guides to the eye.
XPS analysis of the STO thin films and of the corresponding ablation spots of the STO single crystal target.
Values of the initial front velocity, u0 , and driving mass, Mp , of the STO plume as a function of the laser fluence F, as obtained by fitting of the plume front dynamics to the model described in Refs. 16 and 23.
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