Competition between Jahn-Teller coupling and orbital fluctuations in HoVO3

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

*Corresponding author for this work

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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
Pages (from-to)045101-1-045101-11
Number of pages11
JournalPhysical Review. B: Condensed Matter and Materials Physics
Volume79
Issue number4
DOIs
Publication statusPublished - Jan-2009

Keywords

  • crystal structure
  • crystal symmetry
  • fluctuations
  • holmium compounds
  • Jahn-Teller effect
  • long-range order
  • neutron diffraction
  • solid-state phase transformations
  • X-ray diffraction
  • YVO3 SINGLE-CRYSTAL
  • MAGNETIC TRANSITION
  • NEUTRON-DIFFRACTION
  • LAVO3
  • INSULATORS
  • ORDER
  • SPIN

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