Magnetic susceptibility for the Cu2-II-IV-S4 (II=Mn, Fe; IV=Si, Ge or Sn) compounds: Exchange interaction parameters

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.

Bibliographic Details

Main Authors:	Quintero,M, Quintero,E, Moreno,E, Grima-Gallardo,P, Marquina,J, Alvarez,S, Rincón,C, Rivero,D, Morocoima,M, Henao,J. A, Macías,M. A, Briceño,J. M, Rodríguez,N
Format:	Digital revista
Language:	English
Published:	Universidad Simón Bolívar 2017
Online Access:	http://ve.scielo.org/scielo.php?script=sci_arttext&pid=S0255-69522017000100005
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