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- W1972110617 abstract "Ruthenium-based perovskite systems are attractive because their structural, electronic, and magnetic properties can be systematically engineered. The ${mathrm{SrRuO}}_{3}/{mathrm{SrTiO}}_{3}$ superlattice, with its period consisting of one unit cell each, is very sensitive to strain change. Our first-principles simulations reveal that, in the high tensile strain region, it transits from a ferromagnetic metal to an antiferromagnetic insulator with clear tilted octahedra, while in the low strain region, it is a ferromagnetic metal without octahedra tilting. Detailed analyses of three spin-down $mathrm{Ru}ensuremath{-}{t}_{2g}$ orbitals just below the Fermi level reveal that the splitting of these orbitals underlies these dramatic phase transitions, with the rotational force constant of ${mathrm{RuO}}_{6}$ octahedron high up to $16text{ }text{ }mathrm{meV}/{mathrm{Deg}}^{2}$, 4 times larger than that of ${mathrm{TiO}}_{6}$. Differently from nearly all the previous studies, these transitions can be probed optically through the diagonal and off-diagonal dielectric tensor elements. For a 1% change in strain, our experimental spin moment change is $ensuremath{-}0.14ifmmodepmelsetextpmfi{}0.06$ ${ensuremath{mu}}_{B}$, quantitatively consistent with our theoretical value of $ensuremath{-}0.1$ ${ensuremath{mu}}_{B}$." @default.
- W1972110617 created "2016-06-24" @default.
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- W1972110617 date "2012-10-10" @default.
- W1972110617 modified "2023-10-10" @default.
- W1972110617 title "Magnetic Ordering and Structural Phase Transitions in a Strained Ultrathin<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>SrRuO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Superlattice" @default.
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- W1972110617 doi "https://doi.org/10.1103/physrevlett.109.157003" @default.
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