Extension of the molecular-field theory on the magnetic behaviors in paramagnetic Dy3Ga5O12

The magnetic behaviors of the paramagnetic dysprosium gallium garnet (DyGaG) are theoretically investigated in terms of an extensional molecular-field theory. The contribution of the exchange interaction between the dysprosium ions to the magnetic properties of DyGaG is further explored. Here, as to DyGaG, in our model, two magnetic sublattices A and B are suggested. The corresponding magnetic properties of the two magnetic sublattices are discussed, and it is found that χA > χB in DyGaG. Meanwhile, the exchange field coefficients λ1 and λ2 are qualitatively analyzed. The optimum fitting parameters αA and αB associated with the exchange interaction are provided, and some interesting conclusions about these parameters are drawn. Then, the available experiments are successfully fitted by our theoretical model. Additionally, an analysis of the high-field magnetic properties in DyGaG is presented.