Evidence of Ba-rich surface segregation in Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> and Ba-rich surfactant in SrTiO<sub>3</sub>/ Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> stacks grown by combinatorial pulsed laser deposition
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