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Magnetoelectrics

Is CdCr2S4 a multiferroic relaxor?

Abstract

Arising from: J. Hemberger et al. Nature 434, 364–367 (2005)10.1038/nature03348; Hemberger et al. reply

Materials showing simultaneous ferroelectric and magnetic ordering are attracting a great deal of interest because of their unusual physics and potential applications1. Hemberger et al.2 have reported relaxor-like dielectric properties and colossal magnetocapacitance (in excess of 500%) for the cubic spinel compound CdCr2S4 and related isomorphs3,4,5, concluding that CdCr2S4 is a multiferroic relaxor. We argue here, however, that their results might also be explained by a conductive artefact.

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Figure 1: Temperature of dielectric maxima as a function of alternating-current frequency.
Figure 2: Maxwell–Wagner equivalent circuit model of a heterogeneous lossy dielectric.

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Catalan, G., Scott, J. Is CdCr2S4 a multiferroic relaxor?. Nature 448, E4–E5 (2007). https://doi.org/10.1038/nature06156

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