Abstract
We have investigated the magnetic orderings and the magnetic interactions in garnet antiferromagnets AgCa2M2V3O12(M=Mn, Co, Ni) and NaPb2Mn2V3O12, using the powder neutron diffraction and magnetization measurements. In the neutron diffraction measurements, we revealed that the magnetic structures in all samples measured are simple two sublattice antiferromagnetic structures with collinear magnetic moments. We also determined the exchange interactions from the critical magnetic fields Hsat observed in the high field magnetization processes up to 30 T.
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