Abstract
A comprehensive research of the antiferromagnetic (AFM) structures of perovskite-type EuTiO3 and EuZrO3 is carried out by use of the double-time Green's function. All three possible types of AFM configurations are considered, and theoretical results are compared to experiments to extract the exchange parameters J1 and J2 values. The obtained exchanges are employed to calculate the magnetic susceptibility, which is then, in turn, compared to experiments. In this way, we can be certain that the EuZrO3, as well as EuTiO3, is of the G-type structure ever conjectured, and A- and C-types are ruled out. Our achieved J1 and J2 values are compared with those obtained by the mean field approximation and Monte Carlo simulation, and better agree with experiments.
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