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- W1997368712 abstract "${text{LaAlO}}_{3}/{text{SrTiO}}_{3}$ interfaces grown by molecular beam epitaxy show a metal-insulator transition at a critical film thickness of four unit cells of ${text{LaAlO}}_{3}$ on ${text{TiO}}_{2}$-terminated ${text{SrTiO}}_{3}$ substrates. This transition had previously been observed in ${text{LaAlO}}_{3}$ films grown by pulsed laser deposition, where defects related to the growth process have been suggested as playing a role in the interface behavior. X-ray photoemission was used to examine the band offsets and look for an electric field across ${text{LaAlO}}_{3}$ for a range of film thicknesses on both SrO- and ${text{TiO}}_{2}$-terminated ${text{SrTiO}}_{3}$ substrates. These results are compared to the predictions of the polar catastrophe model for the emergence of a metallic interface in this system. We do not find the predicted electric field in the ${text{LaAlO}}_{3}$ or any dependence on substrate termination. While the observation of metal-insulator transitions in ${text{LaAlO}}_{3}/{text{SrTiO}}_{3}$ structures grown by different techniques points to an intrinsic effect, the absence of an electric field in the ${text{LaAlO}}_{3}$ layer is not consistent with the polar catastrophe model of interface metallicity." @default.
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- W1997368712 date "2009-12-23" @default.
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- W1997368712 title "X-ray photoemission studies of the metal-insulator transition in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>LaAlO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mtext>SrTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>structures grown by molecular beam epitaxy" @default.
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- W1997368712 doi "https://doi.org/10.1103/physrevb.80.241107" @default.
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