Competition between Jahn-Teller coupling and orbital fluctuations in HoVO3

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

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

20 Citaten (Scopus)
214 Downloads (Pure)

Samenvatting

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.

Originele taal-2English
Artikelnummer045101
Pagina's (van-tot)045101-1-045101-11
Aantal pagina's11
TijdschriftPhysical Review. B: Condensed Matter and Materials Physics
Volume79
Nummer van het tijdschrift4
DOI's
StatusPublished - jan-2009

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