Magnetic and electrical properties of cation-substituted sulfides MexMn1 − xS (Me = Co, Gd)

• Published in: Physics of the solid state 2009, Vol.51 (4), p.698-701
• Main Authors: Aplesnin, S. S., Ryabinkina, L. I., Romanova, O. B., Sokolov, V. V., Pichugin, A. Yu, Galyas, A. I., Demidenko, O. F., Makovetskiĭ, G. I., Yanushkevich, K. I.
• Format: Article
• Language: English
• Subjects: Physics; Physics and Astronomy; Semiconductors and Dielectrics; Solid State Physics
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783409040076

The temperature dependences of the specific magnetization σ and the electrical resistivity ρ of Me x Mn 1 − 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 Gd 0.05 Mn 0.95 S 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.