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Magnetic and transport properties of Ge(1-x-y)Mn(x)Eu(y)Te crystals withchemical compositions 0.041 < x < 0.092 and 0.010 < y < 0.043 are studied.Ferromagnetic order is observed at 150 < T < 160 K. Aggregation of magneticions into clusters is found to be the source of almost constant, compositionindependent Curie temperatures in our samples. Magnetotransport studies showthe presence of both negative (at T < 25 K) and linear positive (for 25<T <200K) magnetoresistance effects (with amplitudes not exceeding 2%) in the studiedalloy. Negative magnetoresistance detected at T < 25 K is found to be due to atunneling of spin-polarized electrons between ferromagnetic clusters. A linearpositive magnetoresistance is identified to be geometrical effect related withthe presence of ferromagnetic clusters inside semiconductor matrix. The productof the polarization constant and the inter-grain exchange constant, J_P, variesbetween about 0.13 meV and 0.99 meV. Strong anomalous Hall effect (AHE) isobserved for T < T_C with coefficients R_S independent of temperature. Thescaling analysis of the AHE leads to a conclusion that this effect is due to askew scattering mechanism.

Cluster Altered Magnetic and Transport Properties in Eu Co-Doped Ge(1-x)Mn(x)Te