Magnetic Properties of Usovite and Jarlite Derivative Compounds
Résumé
Large interest in the thermodynamics of one-dimensional (1D) systems has been stimulated by the engineering of new materials of this type, as for instance ferrimagnetic chains made up of two unequal spin sublattices spreading in a 1D network. Very often, their peculiar topological features allow an accurate theoretical description of their behavior, so that one can hope to get fundamental insights into the underlying physics of magnetic phenomena. Here we present some results of different bimetallic chains encountered in Usovite and Jarlite compounds. Despite the large differences between the sizes of the alternating sites offered, some compounds are disordered, making irrelevant any description in terms of regularly alternating chains. New theoretical treatments are suggested in order to account for the magnetic behavior.