Abstract
The temperature dependences of the specific magnetization σ and the electrical resistivity ρ of Me x Mn1 − x S single crystals (Me= Co, Gd; x= 0.05) have been studied in the temperature range 80 K < T < 1000 K. The samples under study have revealed the presence of a spontaneous magnetic moment below the Néel temperature (T N) and ferromagnetic clusters in Gd0.05Mn0.95S in the temperature range 146 K < T < 680 K. Substitution of gadolinium for manganese initiates a transition from p-type to n-type conduction. The change in the conduction type is accompanied by an increase in the electrical resistivity at 300 K by approximately one order of magnitude and, accordingly, by a decrease in the activation energy. The magnetic and electrical properties of the crystals under study have been interpreted in terms of the cluster model with temperature-dependent ferromagnetic exchange and an electron localized in this cluster.
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Original Russian Text © S.S. Aplesnin, L.I. Ryabinkina, O.B. Romanova, V.V. Sokolov, A.Yu. Pichugin, A.I. Galyas, O.F. Demidenko, G.I. Makovetskiĭ, K.I. Yanushkevich, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 661–664.
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Aplesnin, S.S., Ryabinkina, L.I., Romanova, O.B. et al. Magnetic and electrical properties of cation-substituted sulfides Me x Mn1 − x S (Me = Co, Gd). Phys. Solid State 51, 698–701 (2009). https://doi.org/10.1134/S1063783409040076
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DOI: https://doi.org/10.1134/S1063783409040076