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- W2059777690 abstract "An optical study of fully strained ultrathin ${mathrm{LaNiO}}_{3}$ films is presented and compared with LDA + DMFT calculations. ${mathrm{LaNiO}}_{3}$ films were grown by pulsed laser deposition on ${mathrm{LaAlO}}_{3}$ and ${mathrm{SrTiO}}_{3}$ substrates which provide compressive and tensile strain, respectively. Optical conductivity data show a Drude peak with a spectral weight that is significantly reduced compared to that obtained from LDA calculations. The extended Drude analysis reveals the presence of a pseudogap around 80 meV for the film on ${mathrm{SrTiO}}_{3}$ and near 40 meV, at low temperature only, for the film on LAO. An unusual temperature dependence of the optical conductivity is observed, with the Drude plasma frequency increasing by up to 20$%$ at low temperature due to spectral weight transfer from bands lying 2--4 eV below the Fermi energy. Such a strong temperature dependence of the Drude spectral weight has previously been reported for correlated electron systems in which a phase transition is present. In ${mathrm{LaNiO}}_{3}$, however, no phase transition is observed." @default.
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- W2059777690 date "2011-02-28" @default.
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- W2059777690 title "Optical study of strained ultrathin films of strongly correlated<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>LaNiO</mml:mi><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2059777690 doi "https://doi.org/10.1103/physrevb.83.075125" @default.
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