Transport and Magnetic Study of Gd Ions in Pb1-ySnyTe

T. Story, M. Arciszewska, P. Łazarczyk, A. Łusakowski, M. Górska, W. Dobrowolski, B. Witkowska, E. Grodzicka, R.R. Gałązka Institute of Physics Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

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Electric conductivity, Hall effect and magnetic susceptibility of Pb1-x-y SnyGdxTe mixed crystals with 0.13 ≤ y ≤ 0.93 and 0.001 ≤ x ≤ 0.04 were experimentally studied over the temperature range 4K ≤ T ≤ 300 K. The incorporation of Gd ions into the Pb1-ySnyTe matrix results in semi-metallic n-type conductivity of the crystals with y < 0.6. For crystals with y > 0.6 one observes only semi-metallic p-type conductivity. We present a model explaining these results in terms of the Sn composition dependence of the location of Gd2+/3+ level with respect to the band edges of PbSnGdTe.

DOI: 10.12693/APhysPolA.92.997 PACS numbers: 75.20.Ck, 75.30.Et