ACTA

Antiferromagnetic EuTe Clusters in Ge_1-xEu_xTe Semiconductors

L. Kilanski^a, M. Górska^a, M. Arciszewska^a, A. Podgórni^a, R. Minikayev^a, B. Brodowska^a, A. Reszka^a, B.J. Kowalski^a, V.E. Slynko^b, E.I. Slynko^b
^aInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
^bInstitute of Materials Science Problems, Ukrainian Academy of Sciences, 5 Wilde Str., 274001 Chernovtsy, Ukraine

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We present studies of structural, electrical, and magnetic properties of Ge_1-xEu_xTe bulk crystals with the chemical composition, x, changing from 0.020 to 0.025. The sample synthesis leads to the formation of EuTe clusters in all our samples. Moreover, the presence of Ge_1-xEu_xTe spinodal decompositions with broad range of chemical contents is observed even for the sample with x=0.020. Spinodal decompositions show the antiferromagnetic order with the Néel temperature, T_N, equal to about 11 K, close to that for EuTe. The magnetic field dependence of the magnetization, M(B), is characteristic of the presence of magnetic inclusions in the samples.

DOI:10.12693/APhysPolA.134.950
topics: diluted magnetic semiconductors, magnetic properties, clusters