Dielectric anomalies and spiral magnetic order in CoCr2O4

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dc.creatorLawes, G.
dc.creatorMelot, B.
dc.creatorPage, K.
dc.creatorEderer, C.
dc.creatorHayward, M. A.
dc.creatorProffen, Th.
dc.creatorSeshadri, R.
dc.date2006-03-10
dc.date.accessioned2026-07-07T07:02:21Z
dc.date.available2026-07-07T07:02:21Z
dc.descriptionWe have investigated the structural, magnetic, thermodynamic, and dielectric properties of polycrystalline CoCr$_2$O$_4$, an insulating spinel exhibiting both ferrimagnetic and spiral magnetic structures. Below $T_c$ = 94 K the sample develops long-range ferrimagnetic order, and we attribute a sharp phase transition at $T_N$ $\approx$ 25 K with the onset of long-range spiral magnetic order. Neutron measurements confirm that while the structure remains cubic at 80 K and at 11 K; there is complex magnetic ordering by 11 K. Density functional theory supports the view of a ferrimagnetic semiconductor with magnetic interactions consistent with non-collinear ordering. Capacitance measurements on CoCr$_2$O$_4$, show a sharp decrease in the dielectric constant at $T_N$, but also an anomaly showing thermal hysteresis falling between approximately $T$ = 50 K and $T$ = 57 K. We tentatively attribute the appearance of this higher temperature dielectric anomaly to the development of \textit{short-range} spiral magnetic order, and discuss these results in the context of utilizing dielectric spectroscopy to investigate non-collinear short-range magnetic structures.
dc.description& Figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0603307
dc.identifierhttp://arxiv.org/abs/cond-mat/0603307
dc.identifierPhys. Rev. B 74 (2006) 024413(1-6).
dc.identifierdoi:10.1103/PhysRevB.74.024413
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108570
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleDielectric anomalies and spiral magnetic order in CoCr2O4
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