Abstract

QUINTERO, M et al. Magnetic susceptibility for the Cu₂-II-IV-S₄ (II=Mn, Fe; IV=Si, Ge or Sn) compounds: Exchange interaction parameters. Rev. LatinAm. Metal. Mater. [online]. 2017, vol.37, n.1, pp.27-34. ISSN 0255-6952.

Measurements of magnetic susceptibility χ as a function of temperature (from 2 to 300 K) were made on polycrystalline samples of the compounds Cu₂MnSiS₄, Cu₂MnGeS₄, Cu₂MnSnS₄, Cu₂FeSiS₄ and Cu₂FeGeS₄. From the 1/χ versus T curves, it was concluded that the samples were antiferromagnetic. These curves were also used to determine values of the Néel temperature T_N and the Curie-Weiss temperature θ for each compound. When the values of T_N and θ are plotted against its molecular weight W, it was found that the compounds containing Mn lie on the same straight line, while those with Fe lie on a different one. For each compound, an analysis was carried out in terms of the simple mean-field theory and using the virtual transition model of Geertsma et al. for exchange interaction, and values of exchange interaction parameters were determined from the measured T_N and θ data.

Keywords : magnetic semiconductor compound; magnetic properties; magnetic exchange interaction.

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