G. M. Abramova, N. V. Volkov, G. A. Petrakovskii, E. Mita, O. A. Bayukov, D. A. Velikanov, A. M. Vorotynov, V. V. Sokolov, A. F. Bovina, “Metal-insulator transition in Fe$_x$Mn$_{1-x}$S crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2007, Volume 86, Issue 6,Pages <nobr>427

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Metal-insulator transition in Fe$_x$Mn$_{1-x}$S crystals

G. M. Abramova^a, N. V. Volkov^a, G. A. Petrakovskii^a, E. Mita^b, O. A. Bayukov^a, D. A. Velikanov^a, A. M. Vorotynov^a, V. V. Sokolov^c, A. F. Bovina^a

^a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences
^b Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences
^c Osaka University Toyonaka

Abstract: Results of an experimental study of MnS, FeS, and Fe_xMn_1−xS single crystals are presented. The phase composition, the lattice parameters, and the state of paramagnetic ions in Fe_xMn_1−xS have been determined by x-ray diffraction analysis and Mössbauer spectroscopy. A sequence of transitions have been found in iron manganese sulfide with x = 0.29 at temperatures T ₁ ≈ 25–50 K, T ₂ ≈ 125 K, and T ₃ ≈ 190 K with a change in kinetic properties and the formation of a metallic state at low temperatures T ≈ 2 K. The possibility of a Mott-Hubbard transition in Fe_xMn_1−xS sulfides with variation of the composition and the temperature is discussed.

PACS: 71.27.+a, 71.30.+h, 72.80.Ga, 74.25.На

Received: 20.07.2007