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• W2123403602 abstract "In the Mott-Hubbard insulators ${text{YTiO}}_{3}$ and ${text{SmTiO}}_{3}$ we study optical excitations from the lower to the upper Hubbard band, $|{d}^{1}{d}^{1}⟩ensuremath{rightarrow}|{d}^{0}{d}^{2}⟩$. The multipeak structure observed in the optical conductivity reflects the multiplet structure of the upper Hubbard band in a multiorbital system. Absorption bands at 2.55 and 4.15 eV in the ferromagnet ${text{YTiO}}_{3}$ correspond to final states with a triplet ${d}^{2}$ configuration, whereas a peak at 3.7 eV in the antiferromagnet ${text{SmTiO}}_{3}$ is attributed to a singlet ${d}^{2}$ final state. A strongly temperature-dependent peak at 1.95 eV in ${text{YTiO}}_{3}$ and 1.8 eV in ${text{SmTiO}}_{3}$ is interpreted in terms of a Hubbard exciton, i.e., a charge-neutral (quasi-) bound state of a hole in the lower Hubbard band and a double occupancy in the upper one. The binding to such a Hubbard exciton may arise both due to Coulomb attraction between nearest-neighbor sites and due to a lowering of the kinetic energy in a system with magnetic and/or orbital correlations. Furthermore, we observe anomalies of the spectral weight in the vicinity of the magnetic ordering transitions, both in ${text{YTiO}}_{3}$ and ${text{SmTiO}}_{3}$. In the $G$-type antiferromagnet ${text{SmTiO}}_{3}$, the sign of the change of the spectral weight at ${T}_{N}$ depends on the polarization. This demonstrates that the temperature dependence of the spectral weight is not dominated by the spin-spin correlations, but rather reflects small changes of the orbital occupation." @default.
• W2123403602 created "2016-06-24" @default.
• W2123403602 creator A5032299796 @default.
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• W2123403602 date "2008-08-26" @default.
• W2123403602 modified "2023-09-30" @default.
• W2123403602 title "Mott-Hubbard exciton in the optical conductivity of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>YTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>SmTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W2123403602 doi "https://doi.org/10.1103/physrevb.78.075122" @default.
• W2123403602 hasPublicationYear "2008" @default.
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