MULTIAXIAL ANTIFERROMAGNETIC STRUCTURES AND QUADRUPOLAR INTERACTIONS

We give the complete set of spontaneous [1/200] antiferromagnetic stru ctures which can develop on a simple cubic lattice. By means of fourie r analysis and molecular field approximation, we then discuss the rela tion between these structures' stability and the dispersion curves of the quadrupolar interactions. The different types of structures and th eir relative energies are also considered for the case of field-induce d structures. The results of this work give a framework for the study and understanding of the H-T phase diagrams of [1/200] cubic antiferro magnets.