Probing orbital fluctuations in RVO 3 (R = Y, Gd, or Ce) by ellipsometry

J. Reul, A. A. Nugroho, T. T M Palstra, M. Grüninger

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    19 Citations (Scopus)

    Abstract

    We study optical excitations across the Mott gap in the multiorbital Mott-Hubbard insulators RVO 3. The multipeak structure observed in the optical conductivity can be described consistently in terms of the different 3d3 multiplets or upper Hubbard bands. The spectral weight is very sensitive to nearest-neighbor spin-spin and orbital-orbital correlations and thus shows a pronounced dependence on both temperature and polarization. Comparison with theoretical predictions based on either rigid orbital order or strong orbital fluctuations clearly rules out that orbital fluctuations are strong in RVO 3. Both the line shape and the temperature dependence give clear evidence for the importance of excitonic effects.

    Original languageEnglish
    Article number125128
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number12
    DOIs
    Publication statusPublished - 19 Sep 2012

    Fingerprint

    Ellipsometry
    ellipsometry
    Optical conductivity
    orbitals
    Photoexcitation
    Polarization
    Temperature
    line shape
    fine structure
    insulators
    conductivity
    temperature dependence
    polarization
    predictions
    excitation
    temperature

    Cite this

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    abstract = "We study optical excitations across the Mott gap in the multiorbital Mott-Hubbard insulators RVO 3. The multipeak structure observed in the optical conductivity can be described consistently in terms of the different 3d3 multiplets or upper Hubbard bands. The spectral weight is very sensitive to nearest-neighbor spin-spin and orbital-orbital correlations and thus shows a pronounced dependence on both temperature and polarization. Comparison with theoretical predictions based on either rigid orbital order or strong orbital fluctuations clearly rules out that orbital fluctuations are strong in RVO 3. Both the line shape and the temperature dependence give clear evidence for the importance of excitonic effects.",
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    Probing orbital fluctuations in RVO 3 (R = Y, Gd, or Ce) by ellipsometry. / Reul, J.; Nugroho, A. A.; Palstra, T. T M; Grüninger, M.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 12, 125128, 19.09.2012.

    Research output: Contribution to journalArticleAcademicpeer-review

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    T1 - Probing orbital fluctuations in RVO 3 (R = Y, Gd, or Ce) by ellipsometry

    AU - Reul, J.

    AU - Nugroho, A. A.

    AU - Palstra, T. T M

    AU - Grüninger, M.

    PY - 2012/9/19

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    AB - We study optical excitations across the Mott gap in the multiorbital Mott-Hubbard insulators RVO 3. The multipeak structure observed in the optical conductivity can be described consistently in terms of the different 3d3 multiplets or upper Hubbard bands. The spectral weight is very sensitive to nearest-neighbor spin-spin and orbital-orbital correlations and thus shows a pronounced dependence on both temperature and polarization. Comparison with theoretical predictions based on either rigid orbital order or strong orbital fluctuations clearly rules out that orbital fluctuations are strong in RVO 3. Both the line shape and the temperature dependence give clear evidence for the importance of excitonic effects.

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