Magnetic interactions in Ge1−xEuxTe semiconductors: random distribution of magnetic Eu ions versus spinodal decompositions

We present the studies of structural, magnetotransport, and magnetic properties of Ge1−x Eu x Te bulk crystals with the chemical composition, x, changing from 0.008 to 0.025. For the samples with x > 0.015 the sample synthesis leads to formation of Ge1−x Eu x Te spinodal decompositions with a broad range of chemical contents. The presence of Ge1−x Eu x Te spinodal decompositions is responsible for the antiferromagnetic order in our samples with x > 0.015. For the samples with x