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

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