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Interface properties and built-in potential profile of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mspace width="4pt" /><mml:mi>LaCr</mml:mi></mml:mrow><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>SrTi</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> superlattice determined by standing-wave excited photoemission spectroscopy
$\mathrm{LaCr}{\mathrm{O}}_{3}\phantom{\rule{0.28em}{0ex}}(\mathrm{LCO})/\mathrm{SrTi}{\mathrm{O}}_{3}\phantom{\rule{0.28em}{0ex}}(\mathrm{STO})$ heterojunctions are intriguing due to a polar discontinuity along $[001]$, exhibiting two distinct and controllable charged interface structures [${(\mathrm{LaO})}^{+}/{(\mathrm{Ti}{\mathrm{O}}_{2})}^{0}$ and ${(\mathrm{SrO})}^{0}/{(\mathrm{Cr}{\mathrm{O}}_{2})}^{\ensuremath{-}}$] with induced polarization, and a resulting depth-dependent potential. In this study, we have used soft- and hard-x-ray standing-wave excited photoemission spectroscopy (SW-XPS) to quantitatively determine the elemental depth …