Resumen

MARQUINA, J. et al. Study of the critical-fields and the thermal broadening in polycrystalline Ag₂FeGeSe₄ semiconducting compound. Rev. mex. fis. [online]. 2017, vol.63, n.5, pp.456-460. ISSN 0035-001X.

We show that a phenomenological model based on sublattice magnetization describes the temperature and field dependent magnetism in the Ag2FeGeSe4 semiconductor compound with wurtz-stannite-type structure. The model successfully finds the antiferromagnetic (AF), spin flop (SF) and paramagnetic (P) phases for all magnetization curves below the Néel temperature. The Langevin classical function instead of the Brillouin one is used in the analysis of the phase transitions to take into account the randomness of the magnetic moments given the polycrystalline nature of the samples. The critical-fields and the thermal broadening of the phase transitions were also found. The model was tested in the Ba3Cu3In4O12 and Ba3Cu3Sc4O12 compounds, and was successfully identified AF, SF and P phases in these materials.

Palabras llave : Magnetic semiconductors; antiferromagnetic; magnetization curves.

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