Magnetic order and ice rules in the multiferroic spinel FeV 2O 4

G. J. MacDougall, V. O. Garlea, A. A. Aczel, H. D. Zhou, S. E. Nagler

Research output: Contribution to journalArticlepeer-review

Abstract

We present a neutron-diffraction study of FeV 2O 4, which is rare in exhibiting spin and orbital degrees of freedom on both cation sublattices of the spinel structure. Our data confirm the existence of three structural phase transitions previously identified with x-ray powder diffraction and reveal that the lower two transitions are associated with sequential collinear and canted ferrimagnetic transitions involving both cation sites. Through consideration of local crystal and spin symmetry, we further conclude that Fe2 + cations are ferro-orbitally ordered below 135 K and V3 + orbitals order at 60 K, in accordance with predictions for vanadium spinels with large trigonal distortions and strong spin-orbit coupling. Intriguingly, the direction of ordered vanadium spins at low temperature obey "ice rules" more commonly associated with the frustrated rare-earth pyrochlore systems.

Original languageEnglish (US)
Article number060414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number6
DOIs
StatePublished - Aug 30 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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