Competition between Jahn-Teller coupling and orbital fluctuations in HoVO3

G.R. Blake, A.A. Nugroho, M.J. Gutmann, T.T.M. Palstra

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    Abstract

    We have carried out a detailed study of the structural properties of HoVO3 perovskite using a combination of single-crystal neutron diffraction and synchrotron x-ray and neutron powder diffraction. We focus on the competition between one-dimensional fluctuations of the occupied vanadium d orbitals and coherent Jahn-Teller distortion due to long-range orbital ordering. At room temperature orbital fluctuations are dominant. Below 188 K a structural phase transition from orthorhombic Pbnm to monoclinic Pb11 symmetry takes place, corresponding to a state where strong orbital fluctuations are superimposed on an underlying orbitally ordered state. However, the fluctuations are not strong enough to give rise to a long-range orbitally dimerized state as theoretically predicted. Ordering of the vanadium spins at 114 K has little effect on the orbital fluctuations, but the orbital ordering becomes coherent below a first-order transition to an orthorhombic Pbnm phase at 40 K.
    Original languageEnglish
    Article number045101
    Number of pages11
    JournalPhysical Review B (Condensed Matter and Materials Physics)
    Volume79
    DOIs
    Publication statusPublished - Jan 2009

    Fingerprint

    Vanadium
    Jahn-Teller effect
    orbitals
    Neutron powder diffraction
    Neutron diffraction
    Synchrotrons
    Perovskite
    Structural properties
    Phase transitions
    Single crystals
    X rays
    vanadium
    Temperature
    neutron diffraction
    synchrotrons
    neutrons
    single crystals
    symmetry
    room temperature
    diffraction

    Cite this

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    abstract = "We have carried out a detailed study of the structural properties of HoVO3 perovskite using a combination of single-crystal neutron diffraction and synchrotron x-ray and neutron powder diffraction. We focus on the competition between one-dimensional fluctuations of the occupied vanadium d orbitals and coherent Jahn-Teller distortion due to long-range orbital ordering. At room temperature orbital fluctuations are dominant. Below 188 K a structural phase transition from orthorhombic Pbnm to monoclinic Pb11 symmetry takes place, corresponding to a state where strong orbital fluctuations are superimposed on an underlying orbitally ordered state. However, the fluctuations are not strong enough to give rise to a long-range orbitally dimerized state as theoretically predicted. Ordering of the vanadium spins at 114 K has little effect on the orbital fluctuations, but the orbital ordering becomes coherent below a first-order transition to an orthorhombic Pbnm phase at 40 K.",
    author = "G.R. Blake and A.A. Nugroho and M.J. Gutmann and T.T.M. Palstra",
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    Competition between Jahn-Teller coupling and orbital fluctuations in HoVO3. / Blake, G.R.; Nugroho, A.A.; Gutmann, M.J.; Palstra, T.T.M. .

    In: Physical Review B (Condensed Matter and Materials Physics), Vol. 79, 045101, 01.2009.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Competition between Jahn-Teller coupling and orbital fluctuations in HoVO3

    AU - Blake, G.R.

    AU - Nugroho, A.A.

    AU - Gutmann, M.J.

    AU - Palstra, T.T.M.

    PY - 2009/1

    Y1 - 2009/1

    N2 - We have carried out a detailed study of the structural properties of HoVO3 perovskite using a combination of single-crystal neutron diffraction and synchrotron x-ray and neutron powder diffraction. We focus on the competition between one-dimensional fluctuations of the occupied vanadium d orbitals and coherent Jahn-Teller distortion due to long-range orbital ordering. At room temperature orbital fluctuations are dominant. Below 188 K a structural phase transition from orthorhombic Pbnm to monoclinic Pb11 symmetry takes place, corresponding to a state where strong orbital fluctuations are superimposed on an underlying orbitally ordered state. However, the fluctuations are not strong enough to give rise to a long-range orbitally dimerized state as theoretically predicted. Ordering of the vanadium spins at 114 K has little effect on the orbital fluctuations, but the orbital ordering becomes coherent below a first-order transition to an orthorhombic Pbnm phase at 40 K.

    AB - We have carried out a detailed study of the structural properties of HoVO3 perovskite using a combination of single-crystal neutron diffraction and synchrotron x-ray and neutron powder diffraction. We focus on the competition between one-dimensional fluctuations of the occupied vanadium d orbitals and coherent Jahn-Teller distortion due to long-range orbital ordering. At room temperature orbital fluctuations are dominant. Below 188 K a structural phase transition from orthorhombic Pbnm to monoclinic Pb11 symmetry takes place, corresponding to a state where strong orbital fluctuations are superimposed on an underlying orbitally ordered state. However, the fluctuations are not strong enough to give rise to a long-range orbitally dimerized state as theoretically predicted. Ordering of the vanadium spins at 114 K has little effect on the orbital fluctuations, but the orbital ordering becomes coherent below a first-order transition to an orthorhombic Pbnm phase at 40 K.

    U2 - 10.1103/PhysRevB.79.045101

    DO - 10.1103/PhysRevB.79.045101

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    JO - Physical review B: Covering condensed matter and materials physics

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