Features of Energy Spectrum of Pb1-xMnxTe Doped with V

A.I. Artamkina, A.A. Dobrovolskya, P. Dziawab, T Storyb, E.I. Slynkoc, V.E. Slynkoc, L.I. Ryabovaa and D.R. Khokhlova aM.V. Lomonosov Moscow State University, Vorobjevy Gory 1, Moscow 119992, Russia bInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland cChernovtsy Division of Institute of Problem of Semiconductor Material Science, Ukrainian Academy of Sciences, I. Vilde 5, Chernovtsy 274001, Ukraine

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Received: 17 06 2006;

Recently new effects that are not characteristic of undoped lead telluride, such as the Fermi level pinning, giant negative magnetoresistance, were observed in Pb1-xMnxTe alloys doped with transition and rare earth elements - Cr, Mo, Yb. We have studied transport and magnetic properties of Pb1-xMnxTe doped with another transition element - vanadium. A series of Pb1-xMnxTe(V) samples of different composition and degree of doping was investigated. It was observed that the resistivity demonstrates activation behavior at low temperatures for the samples with considerable amount of vanadium as well as for the samples without vanadium. The activation energy is proportional to the Mn content. In some of the samples, photoconductivity was observed at low temperatures. The results are discussed in terms of a model assuming formation of the impurity level by the vanadium impurity and the effect of the Fermi level pinning by this level.

DOI: 10.12693/APhysPolA.110.151 PACS numbers: 71.20.Nr, 71.28.+d, 71.55.-i, 72.40.+w