CdV2O4: A rare example of a collinear multiferroic spinel

Details CdV2O4: A rare example of a collinear multiferroic spinel CdV2O4: A rare example of a collinear multiferroic spinel

2010-09-21

arxiv.org/abs/1009.4077v1

Phys. Rev. B 83, 060402(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 3 figures

Scientific paper

10.1103/PhysRevB.83.060402

By studying the dielectric properties of the geometrically frustrated spinel CdV2O4, we observe ferroelectricity developing at the transition into the collinear antiferromagnetic ground state. In this multiferroic spinel, ferroelectricity is driven by local magnetostriction and not by the more common scenario of spiral magnetism. The experimental findings are corroborated by ab-initio calculations of the electric polarization and the underlying spin and orbital order. The results point towards a charge rearrangement due to dimerization, where electronic correlations and the proximity to the insulator-metal transition play an important role.

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