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- W2028183022 abstract "While correlated electron behavior is to be expected at oxide interfaces (IFs) involving Mott insulators, we show how strong correlations in the oxygen $2p$ states may be necessary to account for observed insulating behavior at charged (001)-IFs between the band insulators $mathrm{La}mathrm{Al}{mathrm{O}}_{3}$ and $mathrm{Sr}mathrm{Ti}{mathrm{O}}_{3}$. Using correlated band theory applied to the O $2p$ states, an insulating $p$-type IF is obtained only when a disproportionated, charge-, orbital-, and spin-ordered O ${P}_{ensuremath{pi}}$ magnetic hole is formed, centered between ${mathrm{Al}}^{3+}$ ions in the $mathrm{Al}{mathrm{O}}_{2}$ layer at the IF. As an alternative explanation, charge compensation by oxygen vacancies that accommodate the holes as charge-conjugate F centers is modeled. For the $n$-type IF, a charge disproportionated ${mathrm{Ti}}^{4+}+{mathrm{Ti}}^{3+}$ layer is obtained with ferromagnetic alignment of the spins resulting from occupied ${d}_{xy}$ orbitals at checkerboard arranged ${mathrm{Ti}}^{3+}$ sites. Electron hopping on a 50% occupied Ti sublattice (a quarter-filled band) and/or lattice relaxations are discussed as origin of the measured conductivity." @default.
- W2028183022 created "2016-06-24" @default.
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- W2028183022 date "2006-07-18" @default.
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- W2028183022 title "Charge localization or itineracy at<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>La</mml:mi><mml:mi mathvariant=normal>Al</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>∕</mml:mo><mml:mi mathvariant=normal>Sr</mml:mi><mml:mi mathvariant=normal>Ti</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>interfaces: Hole …" @default.
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- W2028183022 doi "https://doi.org/10.1103/physrevb.74.035112" @default.
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