Temperature independence of the dielectric constant in the antiferromagnetic iron intergrowth: Sr4Fe2.5O7.25(SO4)0.5 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics and Chemistry of Solids Année : 2019

Temperature independence of the dielectric constant in the antiferromagnetic iron intergrowth: Sr4Fe2.5O7.25(SO4)0.5

Résumé

The magnetic structure of the anisotropic compound Sr4Fe2.5O7.25(SO4)0.5 has been determined by means of neutron diffraction and Mossbauer spectroscopy. Spins are lying in the basal plan within an antiferromagnetic G type structure. Depending on which species (O2- or SO42-) is surrounding iron atoms, latter exhibit 15% of difference on their magnetic moment at 5 k. This is in agreement with the quantitative representation of the different magnetic contributions of the Mossbauer spectrum. The compound appears to be a good dielectric, without any transition between 5 K and 400 K and a dielectric constant which is mostly temperature independent. A significate sensitivity of εr to an external applied magnetic field is finally detected.
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hal-02112069 , version 1 (26-04-2019)

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B. Gonano, F. Veillon, Y. Bréard, D. Pelloquin, V. Caignaert, et al.. Temperature independence of the dielectric constant in the antiferromagnetic iron intergrowth: Sr4Fe2.5O7.25(SO4)0.5. Journal of Physics and Chemistry of Solids, 2019, 127, pp.88-93. ⟨10.1016/j.jpcs.2018.12.009⟩. ⟨hal-02112069⟩
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