Friday, July 19, 2013

1307.4775 (E. D. Mun et al.)

Magnetic Field Induced Transition in the Multiferroic Spinel CdV2O4    [PDF]

E. D. Mun, Gia-Wei Chern, V. Pardo, F. Rivadulla, V. S. Zapf, C. D. Batista
We study the frustrated multiferroic spinel compound CdV2O4 in pulsed magnetic fields up to 65 T. The electric polarization is suppressed for fields above 30 T indicating a field induced quantum phase transition. The existence of this transition is also reflected by a change of slope in the field dependence of the uniform magnetization. By modeling the magnetic properties in the presence of strong spin-orbit coupling characteristic of vanadium spinels, we show that the field-induced transition can be explained by including the effects of the local trigonal crystal field. This distortion induces net magnetization in one of the competing magnetic orderings, which is therefore stabilized by large enough magnetic fields.
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